Newbie has Questions.

I have been playing Domions2 demo. For the past couple monthes and have finaly ordered the full game. I have also been a lurker at this forum, reading it several times aday.
My questions:
It seems to me that the whole mid-end game phase is all about massing deviles/demons and such, is this true? Do national troops lose their power at this time?
If every one gets devils and demons, how does races like arco, or pyth get them?
When does the late game time start?
On average from turns 1-10 on indie 9 how many provinces you get?
Are Nifeil Giants and Ulm Black templar incredibly powerful in multiplayer as they are against the AI?
As ulm/jotunhiem, whats the best way to take down Mountain Citidals?
Sry I have so many questions.