Some about class for me:
Sister have weakest block at the game. But in spite of it, weakness compensates strong fireballs damage.
Our main enemies are inqs. They can kill us easily. There are only one thing, that can rescue us - "shock wave". But this ability opened only with 10 level. When you get up inqs - go behind him and do power attack at his back. He can't block it, and its will help you kill him. At battle with inq, essence block all them power attacks.

With 10 level use "meditation". 2-3 stacks will help you.
"flaming valley" and "torrent of flame" will be such useless to 30 level. Most usefull your abilities are "heavenly fire", "flaming curse", "magickal silence", "shock wave" and sometimes "meditation".
If you observe enemies paladin at the battlefield - shot to them, when you kill them. Otherwise all you spells will be useless.

So, how would stupid it's no sounds - you should be so close to the you ally, how you can, so as any equall inq or orcs will kill you without chance. Allies can rescue you!

This is good and all, but what abilities should i be getting first?

I can also help you make these understandable by people who know english, because currently the english in those pictures is an absolute mess

Magical Silence
Mana is an eternal problem for elves

Ok, i will be pleased=)