go to the site, look at the bottom. it says Become a Vendor. it will list the requirements there. a payment, a string of questions, pictures of your actual product, etc. I forget how much a vendor bond is, or if it's been raised. Go log in and check it out. its pretty simple, just be a good person and do good business.
lol yeah deosnt get much simpler then this. its also important to learn good OpSec, for the sake of keeping your operation safe, but also your customers.