Every Druid build is a viable leveling build nowadays.
If you want to level balance i advice you to take the following build:
http://www.wowhead.com/?talent=0xGbuVcoIzhV
this is roughly what you will be getting towards lvl 50,
Just start at the base, and allways concentrate on the highest rank talents you can get at the your lvl, if u got spare points before you can go to the next rank, backtrack :)
If you are solo leveling balance, i found the best way to be to use something along the lines of the following rotation:
Starfire, Entangaling roots, wrath, wrath, wrath
If u got questions feel free to ask