Facebook Ads for Ecommerce: My Complete Founder's Guide

Facebook ads are the most consistent traffic source an online store has, and I know because I once turned them off. Reviewing a P&L heavy with marketing spend, I impulsively paused all of Hero Packaging's campaigns to save $30,000 a month, planning to substitute cheaper channels. Within 24 hours our website traffic halved. Sales slowed with it, and no combination of email, social and SEO could refill the gap. This guide is the system I rebuilt and still run: how the account is structured, what to spend, and the exact campaigns I set up for cold audiences, warm audiences and past customers.

One note before the mechanics. Meta changes its ad manager interface constantly, so I teach audience strategy rather than button locations. Learn the logic and you can find the buttons in whatever the interface looks like this quarter.

How a Facebook ads account is structured

Everything in Meta's ad platform hangs off three levels. The campaign level sets your objective and budget. The ad set level defines the audience. The ad level holds the actual creatives people see. Get comfortable with those three layers and the whole system stops being intimidating.

The objective decision matters more than beginners realise. Almost always choose sales or conversions, even when your goal is awareness. The awareness and traffic objectives tell Meta to find cheap eyeballs, and it obliges by showing your ad to people who click everything and buy nothing. The conversions objective points the algorithm at people who actually purchase, and repeated exposure to likely buyers builds brand recognition anyway. You get the awareness for free.

How much should you spend on Facebook ads?

My rule of thumb: test 10 per cent of your average daily revenue as your total daily Meta spend. If you turn over $500 a day, start around $50 a day across all campaigns. A brand-new business without revenue history should allocate $500 to $1,000 a month from its starting marketing budget and adjust with the data.

Then check the spend against the whole business. I track a metric called the marketing efficiency ratio: total paid ad spend divided by total revenue. For most businesses a healthy range is 15 to 35 per cent. Below that you are probably leaving growth on the table. Above it, your ads are eating your margin and something in the funnel needs fixing before you scale.

Cold audiences: the top-of-funnel setup

The concept driving cold campaigns is what I call brain space: the share of a consumer's mind your brand occupies when a purchase decision arrives. You win it by showing up wherever your market spends time, and Meta ads are the fastest paid route there. Australian haircare brand BondiBoost proved the model when launching The Blowout Brush in 2021: after three years of influencer-led marketing they went heavy on Facebook ads across multiple age brackets and locations and took more than 20,000 orders at launch, largely from new customers. One of them was my mum, who had never mentioned hair tools to me in her life.

I run two cold campaigns at the same time. The first uses interest-based targeting. Say you sell kids' activewear: target parents, search interests by typing your market into the interests field, pick the ones that fit, and optionally intersect a second interest like exercise for kids to sharpen it, at around $20 a day. Keep demographics broad. Narrowing by age and gender usually just limits reach, because Meta's data will find the right people faster than your assumptions will.

The second is an Advantage+ campaign, where Meta's AI picks the audience entirely. There is no ad set level, just campaign settings and creatives. Reuse the ads from your interest campaign so the two approaches compete head to head. Running both widens the funnel opening as far as it will go.

Creative and copy for cold audiences

Do not show founder stories or behind-the-scenes content to cold audiences. They have no idea who you are and they will scroll straight past. Cold creative needs to be direct. The formats that work for me: a call-out image, meaning a clean product photo with arrows to benefits like '12-hour wear' and 'comes in 18 colours'; a short try-on or in-use video with music and a single feature overlay; an 'as featured in' carousel pairing lifestyle shots with press quotes; and a TikTok-style video with a strong hook, like opening on bad sleepers if you sell silk pillowcases.

Copy has an anatomy. The primary text above the creative is your scroll-stopper: a five-star review quoted with the stars, a question, a bold claim, a discount, or a punchy press quote. The headline under the creative should say what the product is in plain words, use a bit of puffery like 'the jeans that went viral', state a USP like 'Italian-made leather backpack', or offer a first-purchase discount. Never waste the headline on your brand name alone. The small description field is the cherry on top: 'lifetime warranty', 'same-day shipping', 'join 20,000 happy customers'. Headline and description are technically optional, and a brand like LSKD barely uses them, but I recommend using every pixel of real estate you are paying for.

Two tools to lean on. Facebook Ads Library lets you see any competitor's live ads for free, which is the best creative research that exists. Foreplay helps manage ad creation once you are producing at volume.

Warm audiences: the retargeting campaign

Warm means people who know you but have not added to cart: they engaged with an ad, follow or engaged with your Facebook or Instagram, or visited your website. One manual campaign covers them. Objective sales, budget around $20 a day to start, scaled to your means.

Build four custom audiences: website visitors from the last 180 days, Instagram engagers from the last 365, Facebook engagers from the last 365, and add-to-cart from the last 180 days, with that last one used as an exclusion. Anyone who carted is hot, and they belong to a different campaign.

This is where the founder finally gets to appear. Warm viewers already know the brand, so the job is persuading a click: founder videos on why you started, behind-the-scenes and warehouse content, packing-orders videos with a product voiceover, lifestyle and UGC demonstrations, and videos built around one glowing review. Copy can acknowledge the relationship. 'Have you wanted to try this?' 'Over 1,000 people have given this five stars.' 'OK, so you have heard of us, but I bet you did not know this.' When the campaign performs, raise budget in 20 per cent increments and confirm sales keep pace with spend.

Past customers: the highest ROAS you will ever see

In every client ad account I analyse, the campaign retargeting existing customers tops the ROAS table. The audience: website purchasers from the last 180 days, excluding purchasers from the last 30, because recent buyers do not need a nudge and last month's spend should not chase them. That window matches the natural repurchase cycle for most repeat-buy products. Objective sales, manual campaign, around $10 a day, since the pool is small. If your store is young, Meta may tell you the audience is too small to run, and that just means keep building your customer base first.

The best creative here is the dynamic collections ad: a hero image or video with four to six catalogue products beneath it that Meta personalises per viewer based on their browsing and purchase history. For the hero asset, rotate a bestseller collage, a new-drop video, seasonal or gifting visuals, and in-use UGC. Copy speaks to people who know you: 'Running out of your favourite?', 'You may not have seen our last drop', 'We miss you!' Give the campaign a minimum 30-day run before making significant changes.

“The retargeting campaign aimed at past customers always tops the ROAS table. Always. It is the cheapest revenue in the whole account.”

How to know if your Facebook ads are working

Platform dashboards flatter themselves, so judge ads against whole-business numbers. I track eight daily in a plain spreadsheet: revenue, cost of goods sold, rough profit, website visitors, average order value, number of orders, marketing efficiency ratio, and fixed costs as a percentage of revenue. Read it weekly against what you changed in the ad account. If spend rises and the efficiency ratio holds inside 15 to 35 per cent while orders climb, scale. If the ratio blows out, the problem is usually creative fatigue or a leaky product page rather than the algorithm being out to get you.

• Set every campaign objective to sales or conversions.
• Start at 10 per cent of average daily revenue, or $500 to $1,000 a month for a new store.
• Run interest-based and Advantage+ cold campaigns together, excluding visitors and engagers.
• Retarget warm audiences with founder-led creative at about $20 a day.
• Retarget past customers on the 180/30 recipe at about $10 a day with dynamic collections ads.
• Scale winners in 20 per cent increments and judge everything against your marketing efficiency ratio.

I wrote three full chapters on Meta ads in How to Sell Anything Online, one for each funnel stage, with the worked examples and campaign settings laid out step by step. If you want the complete system rather than the summary, start there.