Well, you should first understand how it works and eventually work your way up to making a few purchases before you ever attempt to sell.
In this lesson, students of all ages will learn that eBay is one example of a database that can be sorted many ways. You will learn to search for "fun" things but you won't know how to bid just yet.
My next eBay lesson will be about signing up for an eBay account and Paypal account (younger students need to have their parents handy for that lesson).
Happy Learning!