To start selling in the US, you will need to register on Amazon.com and provide a valid international credit card, phone number, and tax information. For taxes, you will be required to go through an online step-by-step interview that will help you to determine whether you will need to complete a W-9 form (as a U.S. taxpayer) or a W-8BEN (as a non-U.S. taxpayer). For more information click here.
You can also attend LIVE webinars to understand the registration process. Click Here for webinar schedule.