Go to www.alsa-project.org.
Click on 'SoundCard' links, select your manufacturer (Creative), and then find your card. When you find your card, you'll see a link to details on how to set things up. The downloads are available at alsa-project's home page, and the alsa-users mailing list (accessible at the home page, too) is quite useful.
I hope this helps. It will certainly point you in the right direction. I have a SB Live 24-bit card built into my motherboard, and it took a while of tweeking to get it to work.
PS - forgot to mention - you'll definitely need to upgrade alsa (via the directions) to get this card to work; it's newer, and needs the new drivers that aren't shipped yet.