Best use of druids
1.Two points in Spell focus:transmutation
2.Max points in shapechange
3.Two points in spell penetration
4.Max slots Lv1 Entangle
5.Max slots Lv2 Barkskin
6.Max slots Lv3 Call lightning
7.Max slots Lv4 ~ not necessery
8.Max slots Lv5 Static charge
9.Max slots Lv6 ~ not necessery
10.Max slots Lv7 Creeping doom
11.Max slots Lv8 Finger of death
12.Max slots Lv9 Tremor

And once you get to level 22 i usually multi-class to something else because you stop getting wild shapes after that.