The first thing is how many parts are you trying to record with what instruments. Drums are a real science to mike. For other instruments go through your line out on your amp to your sound card line in. Download Audacity or Multitrack studio to record with. They are free,but limit you to recording 2 tracks so you need to mix the 2 tracks down and then keep layering the next track on top of it for as many tracks as you want to record. The downside is that you can't tweak what has already been mixed so each layer has to be right before you mix it with the others. You could of course just buy the software for 50 bucks or so and have unlimited tracks. Vocals, you have to mike though the mike in port on your soundcard. If your amps don't have line out then you will have to mike them. Mike 2 or 3 inches out from edge of speaker cone pointing to the middle of the cone is a popular way of miking them. Hope that helps.
