This page is the whole first-run journey in one place: install the app, choose a plan, then complete the five step setup checklist that takes you from an empty screen to live Amazon listings. Each step has a detailed article of its own, linked below.
Most merchants get through it in well under an hour. The parts that take real time are Amazon's authorisation flow and deciding which products you want on Amazon.
You need three things.
You do not need barcodes or ASINs ready in advance. You will want them eventually, because they are what the app uses to match your products to Amazon, but you can install and explore without them.
Install Amazon Seller Sync from the Shopify App Store. Shopify asks you to confirm which store you are installing on.

Shopify then shows the access grant screen, listing exactly what the app can read and change. Review it and select Install. Shopify returns you to the app inside your Admin.
Note
The app requests only the permissions it needs to run price sync, mapping and listings. Fulfilment by Amazon needs extra order, fulfilment, location and inventory permissions, and it asks for those separately, in-app, and only if you choose to turn that feature on.
This is the first-run gate, and it surprises people, so it is worth stating plainly.
On first open, the entire app is replaced by the plan chooser. There is no dashboard behind it and no way to skip it. Until you pick a plan, nothing else in the app works.

Free is a valid choice. It is a real plan, not a trial that expires. On Free you still get price and Buy Box sync, the Buy on Amazon button, and Fulfilment by Amazon. What you do not get is Product Sync, the Repricer, Inventory Sync, Analytics or the AI tools, and you are limited to one Amazon account, ten mapped products, no per-market overrides, and a 24 hour sync interval.
Paid plans include a 14-day free trial, so choosing one today does not charge you today. Each card lists what it includes. If you are not sure, pick the smallest plan that covers the feature you actually need, because you can change plan later. Read Plans and billing for the full comparison, the add-ons, and what happens when you downgrade.
Once you have a plan you land on the Dashboard. The Finish setting up card at the top is your checklist. It has five steps and ticks each one off as you complete it.
The steps are listed in the order most merchants want them, but only the first one is genuinely a prerequisite for the rest.
For exactly what marks each step done, and why step 3 is the one that most often looks stuck, read the Setup checklist article.
You are set up when all of the following are true.
Once the basics are running, a sensible order is Product Mapping to get live prices flowing, then Product Sync to publish listings, then the Repricer and Analytics once there is enough live data to act on. If you want Amazon to ship your Shopify orders, set up Fulfilment by Amazon whenever you are ready, because it does not depend on the other steps.
If something does not behave as described here, see Troubleshooting.