Hi.
What type of mic do you already have? Is it an SM57 or 58? Yes, you will need a few more mics, but three will get you off to a good start. I've heard some fantasitc drum recordings from a full kit and only three mics. I myself have had decent luck w/ the three mic setup too, although I usually mic the entire kit. Anyway, get yourself two decent- doesn't have to be expensive (C1000s or BG4.1) small diaphram condensor mics to use as overheads, and a good dynamic mis for the kick drum (d112, etc.). Configure the overheads in an XY pattern over the cymbals/toms, as to be able to record in stereo. You'll also get a nice natural room sound from the overheads. Place the kick mic in the sound hole of the drum- duh- the closer to the beater you get, the more "snap" you will get. Back it away to get more "boom." Anyway, these are just some BASIC tips to help you on your way. As AlChuck said, read the trade pubs. They are a great source of info for these things.
Good luck,
ThreeDogg