Nathan, although I personally can’t help you with information, I would like to suggest to contact some online shop owners on eBay. I have been a regular visitor (buyer and seller) for years now on eBay and many people on there have their own online shop also.
My experience with these online shop owners is a very positive one. I am sure there will be some shop owners who could give you the information you need.
I haven’t looked at it, but I can imagine there is even a service available on eBay that will help you set up an online shop.
There are also several forums on eBay allowing you to ask questions.
Celivia