Here;s a good place to start:
http://www.sgxmusic.com/tutorials.htm
Check out Siamey's page as well.
IMO make a separate 14:2 mixer for each of your "groups." Then route each of those mixers to another final 14:2 mixer. Each "group" would consist of says percussion, leads, bass/kick, pad type sounds, FX, etc...
This way when you add a new instrument it just gets added under your group. This also make mastering a helluva lot easier.
If you want your mix to sound clean here is one simple trick. Use 1 type of long reverb (big and lush), 1 short reverb, 1 short delay, and 1 long delay. This will help make sure everything sounds like it is being played in the same space, which will in turn make things sound MUCH cleaner and bigger in fact.
Good luck dude!