I actually stated doing Arena a few weeks ago, too. We're juust doing it to get the points, not so much caring about the rating.
We started out with a 3v3 team... 0-35 so far

but the make up is 2 rogues and a hunter so without a healer we're pretty much screwed.
We have a 5v5 team made up of a warrior, paladin, 2 rogues, and a hunter. Still not too great since you really need at least 2 healers in 5v5 so we're 0-10.
However, last week we started a 2v2 team, my hunter and a rogue. Last week we went 1-10. This week we're 3-7, so we're improving a little bit there. I'm about 2 weeks away now from getting my season 3 gloves.