I got too characters, both pretty low leveled. One is level 11, the other is only Level 4. I need help choosing the one's talent tree and choosing what the others should be.

The Level 11 is a Human Mage with Staff and Swords.

The Level 4 is a Gnomb Warlock.

I normally solo but will sometimes work in a party. I am not sure what talent trees to go down, or if I should go a little into each.