Was up guys (and gals), I too just started useing my computer as my recording studio. I go from my marshall head (useing the line out), into a Tascam 4 track and then into the computer, and I get a pretty decent sound, you have to figure out how to tweak it all digitally :confused: . I use Adobe Audition for my recording software and im really happy with it, the effects are great, its easy to use, and has A TON of features to play with. You can go to www.adobe.com and download a trial version.
BUT, I would suggest you get a good soundcard, and an audio interface. Both of which can be a little costly, but you can get a basic Audio Interface for around $100 and about $150 for the sound card, all good investments if you want to get the best out of your tone.
Anyway, just my opinion. ;)