We Started on Ebay to test the market and then ventured to our own site. Do Your Research and find a community that is going to help you along the way. Without the right foundations your empire will fall. With Sturdy Foundations your empire can reach the sky.
i think, first of all you should know what to sell, if you sell the product as a fabricator, then you should make at list some market researches, if you you want to sell for ex. some thing you do not need, well you already have the ideas
try yahoo free auctions if you don't know where to find them see my profile here and just click on the link free listings and no final value fees you can get a better class of customers also but it does take a bit of time to get established like eBay does you have to earn peoples trust good luck and you can use my auctions as a example if you like
You can start by posting ads for you product on craigslist, it's free. eBay is also free to run the first couple of auctions so you can test it out.