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.
Step 2: The Magical Flower Button
On most cameras, there is a button with a flower by it, or the selector wheel has a flower on it. This is what puts your camera in macro mode, which allows it to focus on very close objects. This is to ensure your photos don't come out blurry.
When you want to take a close-up picture, press the macro button or turn the dial to the flower.
If your camera doesn't support macro, you may still be in luck. As long as it has zooming capabilities, you can take macros of sorts.
How to take good pictures while in macro mode is discussed in the next step, while taking macros with zoom is explained in the step after that.