I've never used MOM personally I don't think the game engine is right for it, it's to random in events, others may differ but I don't trust it.
Out of all the the info justdome posted IMO the best you can adopt is counter and deploy with zonal.
Select orders that best suite your strength and the opponents weakness. Eg, attack heavy defensive set ups with OS trap and defend strong attacking formations with counter.
Don't be afraid to step outside the box with formations, I do it a lot with my formations, seems to confuse the engine. Today I played against a four man MF with only two DMC's directly opposing them, still had 72% possession.
I rarely play the same formation two games on the run, so sticking to one formation has no advantage IMO.
I have not played a game yet with less than 58% possession, I'm in my third season and only lost 3-4 games.
There are many good tips in his guide, there are also a few that are questionable, finding the right balance is the key.