Need help w/amount of actions per turn

[Warmskin]

A few ?'s...
1) Sometimes one of my troops can use a 'talent', a spell, and an attack all in one turn. Sometimes the same guy can only get off a spell. What controls this?
2) Why are all 3 of my talents available at the start of turn 1, but at the start of turn 2 the same guy has no talents available (whited out).
3) Why is it I can finish a battle with 30 rage pts left over e.g., and then go right into the next battle (w/o leaving the map or anything) and have 6 or even 0 rage pts to use?
4) It seems sometimes my Inquisitors can use a talent and still get off an attack, sometimes they use the same talent and their turn is over.

These basic rules of attack and actions per turn need to be explained somewhere thoroughly.
Love the game, though.
Thanks.