If I followed you correctly you can't find out what your sound card is and thus you don't know what module you need to load up.
Change to root and type the following:
# lspci | grep audio
Alternatively if you're a normal user just do the following (provided you have the root password):
$ su -c "lspci | grep audio"
It should print out what sound card it finds connected to your system. Go to
ALSA's website and find out which set of drivers you need. You'll probably want to follow the directions for your specific sound card.
If you don't happen to have lspci available to you it's available at it's
homepage.