An Amazon seller account is a dashboard that allows third-party sellers to manage and list products on Amazon. Sellers can use their account to:

• Add products
• Manage inventory
• Advertise products
• Open support cases
• Fulfill customer orders
• Track payments and expenses
• Manage pricing 

Amazon offers two selling plans:

• Individual: A good option for new sellers or those selling a small volume of items. There’s no monthly subscription fee, but sellers are charged a fee per item sold. The selling plan costs $0.99 per item, plus a referral fee that varies by category. 
• Professional: Costs $39.99 per month plus selling fees. 

Sellers can also use Amazon FBA (Fulfillment by Amazon), which allows Amazon to pick, pack, and ship orders. FBA can be used with either the Individual or Professional selling plan. 

To create an Amazon seller account, you can:

1. Enter your GST number
2. Verify your GST number
3. Enter a store name
4. Enter your pickup address
5. Choose a shipping method
6. Add your bank account details
7. Select a default tax rate
8. List your products
9. Launch your store 

https://www.bigcommerce.com/articles/omnichannel-retail/amazon-fba/#h2_how_does_amazon_fba_work_