Step 1: Cameras
Cell Phone Camera: Most people have these. Unfortunately, though, they take cruddy macros. They're good for normal photos, like you and your friends, but for anything closer than a foot away, they generally stink.
Webcam: Due to the manual focus ring, these types of cameras can sometimes take excellent close-ups. The problem with these is that the resolution of photos is quite small, and the quality is usually quite low. Good macros, bad photos.
Normal Camera: These cameras are, of course, the best at macro photography. That's one of the things they were made for. A good camera can cost a little over $200, but you could probably get away with one that's a little cheaper.
In this Instructable we'll be using a normal camera.