Before you start any project, big or small, such as connecting a webcam, it's important to know what you're going to be dealing with. So lay out your webcam materials so you have a clear picture of what you need to do.
Most webcams will have a USB connection, a software disk for their drivers, and, of course, the actual physical camera, where the lens is, which you'll need to put somewhere where you can see it (and where it can see you!)