Warrior Questions

[Bragnir]

Hi everyone, my brother and I are creating two characters so that we can get into 2's with each other. We haven't played since before WoD came out so I have a few questions as we are going into making these characters. I'm making a Gnome Arms Warrior, and he's making a Draenai Elemental Shaman. We were going to get them to 60 and then boost to 90 for the profession boost, but I do have a few questions.

-First off: for the both of us, what are our biggest threats in the arena? What should we be worried?
-2: What professions should we consider taking?
I was going to go JC and Alchemy, & he was going to go BS and Enchanting, we are doing it to help each other out
-3: What do we not need to worry about when it comes to challengers in the arena?
-4: What are our individual weaknesses as a warrior and shaman combo?
-5: Do you have any additional tips for me as a newbie warrior?

-6: This one is for fun, but who would win between the two of us?

Any comments to any of these questions would help me a lot! Thank you for taking the time into replying, have a great day everyone! xD