There are some good tutorials on this subject here: http://www.guitarwar.com/help.php

Should get you up and running with recording.
try to use the line in on your computer instead of the mic. those gateway mics don't sound so good.

The hosts right now are looking for acoustic, classical, jazz, and other non-rock styles. We have about 80% rock/blues hosts hosts and are looking for some other styles to round out the topics covered. You didn't say what style you are into, but wanted to let you know about that.