You have set up buyer and seller accounts at an online auction site, posted a listing, made a sale, and shipped the treasure to the winning bidder. A surprising passion can be stirred by auctioning off an item for more money than you expected. You may decide, quite suddenly, to go into the online auction business full-time, perhaps with no clear idea of how and where to start. You can begin by learning how to organize and build the venture that has seized your imagination.