If you're self taught, I recommend you get a DAW program on your computer and some basic plugins. Download some multitrack recordings as well as speeches and other spoken word material, then play around. Better yet, use recordings of the actual musical during practice. The virtual equipment is nearly identical with the real stuff, and the settings are quite similar. Start with a rough mix, and get a feel of moving the faders and adjusting the gain to get relatively even levels. Work with basic EQ on soloed tracks first, then try it out with everything at once. Unlike in real life, you can try as many times as you like, replay parts, and not worry about annoying the actors :D.

Transitioning from mixing on a computer and a real desk can be quite natural if you actually understand what you're doing - I recommend you read up on how to use each of your plugins and the basic mix technique.

Speaking of reading, also read the manuals of all the equipment you are using. Get a sense of their features and capabilities.

The EQ should be calibrated to your room environment if possible, using an SPL meter or similar. If you don't have that, leave it flat (unless you really need to accentuate the bass or cut down bright treble in the ENTIRE system). Calibrating by ear often causes more problems than benefits, especially with a 32-band setup.

I would leave the compressor off unless you've practiced sufficiently in the DAW to know what it does and how each setting works. I believe what you have there is a 2-channel compressor, meaning that you can set up two different configurations on 2 different sends on your mixer. Different settings (i.e. speaking vs singing) will require different amounts of compression to sound right - experiment with it!