- Install 6-8 white track lights focused on the floor area where the speakers usually stand. Should these be spots or floods? Should I use colors for this area or keep it white? These will be on one dimmer channel
You might consider using some of them for specials (spots) on your speaker, drummer, etc, and the rest as flood fill. I'd leave them white, or perhaps use a bastard amber (like R02) if you want a bit of warmth.
- Install my par cans focused on the stage (again, spots or floods?), maybe purchase another dimmer pack to make it so I can control each color individually. I don't have enough channels to control each color individually now, so I'd probably make one or two channels out of it.
What the pars are good for depends on the lense type. There's usually three types - tight flood (TFL), medium flood (MFL), and wide flood (WFL). The names are pretty self descriptive. I'm gathering you're using them as front light, so, perhaps the same thing as with the tracks.
As far as the dimmers, your dimmers are rated for a specific number of watts. You cannot exceed this or they won't work (the breaker will blow). This is the defining factor for how many lights you put on one circuit. Your par cans are most likely 575W, 750W, or 1000W. The lights will be marked or the bulbs will.
Pars may not necessarily be the best fixture for moving around to light other events. If you describe the other senarios a bit more, it would be easier to help with this.
- Should I keep the colored track lights above the drum kit? They look kind of cool. We want a little overhead stage lighting, both for effect and for reading music on stage.
Should I use white or colors on my speaker?
- Would small par cans and large par cans work well together? Should I eventually put each color in the whole system on one channel?
I'd go with something warm and not excessive like a bastard amber (eg R02 - Rosco #2).
You can intermix lights however you want. It really depends on the field size and intensity you want in each area.