let's see, what fxs do I use when i mix?
compression, reverb, EQ, chorus, flanger, phaser, my anechoic chamber,
what are you trying to accomplish in your mix?
if you are just looking for stuff to try, then I'll give you some ideas using the plugins that come with Cool Edit.
Bass guitar: try compressing it. when compressing mess around with stuff like the threshold, then mess with attack and release times, notice any differences? for something whack, try adding delay. in general bass doesn't usually get treated with delay or reverb unless you are going for something unusual, you'll see.
Vocals: add some reverb. mess with the predelay, room size, wet/dry mix. then mess with the frequency response of the reverb. hear anything you like? save the settings. for something whack, reverse the track, add some reverb or delay (in the edit window, not multitrack window), then reverse the track again and listen.
guitar: try some delay. turn the feedback way down, play around with delay times between 30 - 50 ms. It should start sounding like two guitar player (sort of). it can be a cool effect for some stuff. something whack: use the FFT filter to cut out everything below 300 Hz and everything above 3000 Hz. can you say "wish you were here?"
hope this gets you started, have fun.
oh yeah, i was just kidding about the anechoic chamber.