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.
Question added to topic Marketing • August 8, 2007
How do I decide what price to sell my work on eBay?
I design and create mosaic artwork and want to start selling on eBay. How does one find the right market to start out? I work from a studio in my home, but I don't have a clue where to start.