US company for non-residents?

Hi. A friend and I (European) are thinking about producing a product in China, shipping it to the US and selling it online through a shopify store.

I believe we have to set up an American company for this. I tried to Google for information but the first results I got look a little scammy.

Can anybody share their experience or recommend a company? Also we would love to know experiences with fulfillment companies or amazon fulfillment.

Thank you for the help.