Would someone explain "rage" to me? (and a few other things?)

[Elwin]

1)If you dont see its function means you didnt get chest of rage yet. Which is not good. Do the main quest a bit and gate rage spirits. Its used to use their abilities.
2)
Initiative decides about moving order of untis. Higer intiiative moves first
3) dont get it
4)alchemy 3 is not must, thats no good to learn all posible spells, half of them you willn not ever use.
5) each units has his action points. Its showed by the dots in the right down corner. If unit has 2 action points he can move 1 hex and then shoot for example.