Was looking around and found this resource, it might answer other questions of yours:
http://www.teamcombooks.com/mp3handbook/10.htm
I recommend keeping it simple, use a headphone stereo jack to 2 RCA stereo jacks, as seen here:
http://216.239.63.104/search?q=cache:cOT8_...lient=firefox-a
Yer output on sound card
the cable you need.
