I would honestly question if now is a good time to start that, with manufacturing and shipping all messed up from Covid still, and for the near future. Be careful.
You will most definitely have QC issues comes up, and you won't have a leg to stand on to get your money back from mfg's in China. You get what you pay for.
Also, this would probably answer a few of your questions.
https://sell.amazon.com/sell.html