Answers, in plain words.

Create an account, connect Amazon Ads, and follow the set-up: choose the account, set your goal, pick which automations may act by themselves and when ads should run.

Yes. Each product is a book or a physical product. Books use your KDP royalty as the margin; physical products use price minus cost, Amazon fees and shipping. One account can hold both.

North America, Europe & Middle East, and the Far East regions of Amazon Ads. Connect each region once; its advertising accounts appear in Settings.

Amazon sometimes asks for a fresh sign-in. Settings › Accounts & team shows it, with a button that opens Amazon's sign-in.

The ACoS you want at most, for the whole account or a group of products. Bids come down while a product is above it.

With a margin per product Bidavora shows real profit and each product's break-even click. Without it, 30% is assumed. Add them one by one in Goals or all at once with a spreadsheet.

By products (ASINs) and monthly ad spend; the cheapest plan that covers both fits. Campaigns are unlimited. See Pricing.

Nothing is paused. You pay 1% of the spend above the limit, never more than the next plan up.

In Plan & billing. Your plan runs to the end of the paid period; after that only the brakes keep running (pausing wasted spend, switching back on after a sale, blocking bad searches, selling hours).

You can export it before you go and delete the account in Settings.