Take the stereo out from your recorder to the stereo in of the soundcard. Record your music as a wav file in a wav editing or recording program such as cool edit or Ntrack (or maybe something you already have on your computer) and then burn the wavs to an audio cd.
I have a question. Are you wanting to keep it as multi-track in order to do some additional mixing on the computer (adding effects, EQ, etc...)? If so it gets more difficult because you will have to record each track separatey then lign them up and to your editing in one of the multitrack programs.
Yeah, then in that case I would just get a copy of Magix Audio Cleaning Lab or Steinberg Clean! to some some simple mastering type things and noise reduction then get it on the CD, like I said I prefer Magix.
Then you could just tweak the levels, lead ins and outs in the editing software.
However, as time goes on you'll probably want to record into your computer directly through preamps with new mics, hardware effects, new sound card etc, and then you're a lost soul.