I think I can answer your questions. First of all, we're not yet recruiting for battalion and regimental level positions, so you'll have to be patient
The battles are played by PBEM, or TCP if both parties can agree to meet. Every player only plays one battle at a time (unless he fills in for somebody else, a rare occurrence).
Since the campaign has it's focus on operational level maneuvers, the frequence of tactical battles varies a lot, dependant on the position your battalion is responsible for at the front. If you're assigned to a quiet sector, worst case, you may fight a battle every six months, or, if you're part of an offensive operation, you may fight once a month. That's it. Compared to other campaigns which focus more on fighting battles, the tempo in CMMC is quite glacial :cool:
What you will know of the overall frontline as a battalion commander is limited. Even division commanders often only know their own sector and positions of neighbouring units to their immediate right and left. Generally, as a battalion commander, your regiment will provide you with a briefing, but it'll be quite cursory. The actual operation maps are kept at the respective HQ's (battalion thru Corps), and even those maps are generally inaccurate, due to Fog of war and reporting friction in the chain of command etc. So, what I'm saying is, that no one (except the Gamemasters) actually know 100% what the front line looks like.
We have written a comprehensive set of rules, which is being revised for CMMC2. All aspects of operational warfare pertinent to Corps level operations, are included. The revised rules will be made public when they're ready. The old rules, CMMC1, are available at http://www.combatmission.com/CMMC/Academy/academy.htm.
If you want to see how the first day of the CMMC1 went, check out the cool Flash files at:
http://www.cmmc2.org/CMMC1%5FMultimedia%2Easp
Hope to see you in Russia !