If you want to go full frost http://www.worldofwarcraft.com/info/classes/mage/talents.html?0000000000000000000000000000000000000000000000535323310215010231551 is a viable build.
I think that this build should help out, after that take a couple points into arcane subtlety to save your polymorph resists. After that level 60 build (which you could put some points into frost channeling, winters chill if you wanted) a lot of people do a 10/0/51 build as well for frost (to get arcane concentration).