Most people jump straight to "what product should I sell" — and skip the sequence that actually determines whether that product makes money.

Here's the order that matters, and the mistake at each stage:

1. Foundations — Before touching inventory, know your real costs: referral fees, FBA fulfillment, ad spend as an upfront investment (not an afterthought), and storage fees that roughly triple in Oct-Dec. Skip this and you'll "sell" your way into a loss.

2. Research — Validating a product isn't checking if it's trending. It's checking sell-through rate, return rate, and whether the category is a realistic entry point — not just copying whatever's viral this week.

3. Listings — Keywords and images aren't decoration, they're the whole conversion engine. A technically perfect product with a weak listing loses to a mediocre product with a great one.

4. Scale — This is where most people start (ads) instead of finish. PPC amplifies whatever's already working — it can't fix a broken product-market fit.

We built out this full sequence — step by step, with the actual numbers — into two courses: Amazon FBA Mastery ($58) and a Full Access bundle ($198) that adds cross-border dropshipping and TikTok traffic on top.

If you want the whole roadmap in order instead of piecing it together: https://ecom-growth-lab-official.whop.app

Most new Amazon sellers price a product, subtract what they paid the factory, and call the difference "profit." That number is almost always wrong — and it's the #1 reason people think they're making money while quietly losing it.

Here's the cost chain people forget to run before they ever hit "publish" on a listing:

1. Ad spend as investment, not expense — especially in the first 60-90 days. If you budget $0 for ads because "the product will just sell," you won't rank, and you won't get data to fix anything.

2. Returns — factor in your category's typical return rate. A 5-8% return rate on top of refunded shipping and restocking fees adds up fast on thin-margin products.

3. Storage tiers — Amazon's storage fees roughly triple in Oct-Dec vs the rest of the year, and long-term storage penalties kick in past 180 days. If your cash flow model doesn't account for Q4 storage spikes, you'll get squeezed exactly when you need capital most.

4. Fee creep — referral fees, FBA fulfillment fees, and surcharges get updated yearly. Pull current numbers from Seller Central before you finalize pricing, not from a spreadsheet you built 8 months ago.

The fix isn't complicated: build one living profit model per SKU, update it whenever Amazon changes fees, and treat "profit" as revenue minus every one of these — not just COGS. It's the difference between a product that looks good on paper and one that actually survives Q4.