There is not much more to say about this, you will just have to play the game.
However, I can give you another little morsel: Brigade Upgrades. In Semper Fi, players are allowed to upgrade certain types of brigades to other types (usually a more advanced and expensive type.) For example, if you have a very experienced artillery brigade, you might want to upgrade it to a self-propelled artillery brigade. Well, now you can. The downside is that the brigade is taken from the field and moved to the production queue, though when the upgrade is complete it will automatically deploy back to the division it came from.