Once you've decided what you are going to sell, the next step is to find a web based auction management tool.
The basic level of service for these vendors ranges from free to about $20 per month. If you are selling any volume at all, their services are very worth the investment.
Currently I use Auctiva but I have also heard good things about Vendio and Inkfrog. To find others, do an internet search for "auction management tools".
These services will save you time, money and sanity. I used eBay for many years without one of these services and wasted lots of resources. These tools provide much more robust listing services at much less the price of eBay.