Lowbie Mage PvP Questions

Hello and thank you for looking at my post!
I've got a few questions about low level PvP (15ish-40ish) that I'd love some insight on.
I'm mostly curious about how durable a low level Mage is in WSG. I plan on playing one on the PvE server with my friend (a rogue) strictly for WSG/AB. We'll be getting to x9 of each bracket and PvPing for a while before moving on to the next bracket (not spending much time at 19).
I know that Hunters will be tough to kill and I'm sure Rogues are pretty terrifying at lower gear thresholds, but in general how would you say a Mage contributes to a win? Also, I'd like to note that my friend won't be just sitting around waiting to peel for me. He'll be focusing on healers primarily and I'll be CCing and burning whatever he's trying to kill.
Also, which spec is better for 15-40ish? I assume Frost offers me more survive ability but I know that a lot of Mages seem to enjoy Fire and Arcane too.
Thanks so much for any insight!!
I've got a few questions about low level PvP (15ish-40ish) that I'd love some insight on.
I'm mostly curious about how durable a low level Mage is in WSG. I plan on playing one on the PvE server with my friend (a rogue) strictly for WSG/AB. We'll be getting to x9 of each bracket and PvPing for a while before moving on to the next bracket (not spending much time at 19).
I know that Hunters will be tough to kill and I'm sure Rogues are pretty terrifying at lower gear thresholds, but in general how would you say a Mage contributes to a win? Also, I'd like to note that my friend won't be just sitting around waiting to peel for me. He'll be focusing on healers primarily and I'll be CCing and burning whatever he's trying to kill.
Also, which spec is better for 15-40ish? I assume Frost offers me more survive ability but I know that a lot of Mages seem to enjoy Fire and Arcane too.
Thanks so much for any insight!!