Selling on Amazon US from the UK

I’ve been selling on Amazon UK for a couple of years now and have been wanting to expand to the US, but found it quite daunting in terms of the requirements to ensure compliance.

As I understand it, as a UK registered LTD, I can sign up to Amazon North America and gain access to the US market. All I need is a bank account and a payment card, both of which can be UK based.

Then I can submit my listings and send my stock to the US warehouses who can start fulfilling my orders.

As I understand it, there is a monthly threshold of 10k (iirc) above which you require insurance. Otherwise, in terms of taxes you just need to submit a nil federal tax return due to the tax treaty deal between the US and UK.

What else am I missing or misunderstood anything? What more do I require?