available modules can be found in /lib/modules/.......
also the modules init script should have a section for uncommenting and commenting most kernel modules at boot up, cant remember what the sysV init scripts are called, but they are in /etc, rc something, I think they are numbered rc.1 rc.2 ect etc
you wont need to type the whole thing, just the first part w/o the .o.gz
insmod sb16 would load the soundblaster 16 module, insmod 8139too loads the realek8139 NIC module, they are all abbreviated like this