http://www.youtube.com/watch?v=FNobPc1NbUY
Will give you an idea of how it all works. I would explain more, but I am off to bed in a sec.
If you do wish to try it out, have a look at the Open Fire boxed set, it gives you two sizeable companies to start with, and it is quite cheap to buy.
http://www.flamesofwar.com/hobby.aspx?art_id=3413
The rulebook you get with that is going to evaporate, however it's not a product wide issue, it's just got poor binging for that one book.
in short, you have 2 companies face each other ( multi company battles are easy enough to do) each company is made up of many platoons, ranging from 1-5 tanks, or 7-22 infantry.
It various across the various intelligence briefings (army books) German heavy tanks like the King Tiger for example cost about 345 points per tank, while the Russian T-34 early, will get you about ten tanks for that
The games is split into early war, mid war and late war periods.
My preference is late war, but there is nothing wrong with the other periods.