There is no real use for the frost AOE grind now as quests give more exp anyway , i only use it on lower mobs when farming or getting quests done faster if i can group some of the mobs together to blizzard them.
My advice is read up here on talents and the ways to fight and do not think about frost AOE grinding until you at least get close to level 40 as it will either be slower than questing usually or chances are will put you in that not very nice position of running back to your body when it goes wrong , and yes i have learnt that from my own experiences
My talents except for frostbite are roughly the way to go for AOE farming as you can see from my sig and i think i have them roughly right as i have had no bad comments about my choices but it of course is still a work in progress , i guess i could have taken them a slightly different way but i have a pretty good idea of where i am going , and of course they work well for me.