Digital Audio Interface For Computer Recording
You need one of these to hook up your inputs to your computer. Audio interfaces will be either USB and MIDI or FireWire. One of the best is this one:
MOTU Traveler FireWire Audio Interface
A complete and very versatile interface for most home studios. Will work with the most popular Mac and PC operating sytems and most any software program. Not cheap though, it'll run you about $900.