The best place to start is by looking at what others are doing with similar products on eBay. Then make a list of what you like and what you don't like about how their shops are set up, what their policies are, etc. Then formulate your own mini operations plan.
You might also want to read the book eBay Income by Cheryl L. Russell.
By buying from a company that's actively doing something praiseworthy, affluent consumers feel they're helping out as well-without having to do anything other than make a purchase they were going to make anyway. Find out how you can align your company with a cause they'd like to support.