Hey,
When I hit 70 2 months ago I had a full set of leather moonkin greens/blues that I had been picking up while leveling. Immediately I went to the lower city vendor in Shatt and bought the blue PVP gear. It costs like 25-50 gold a piece but offers resilience and decent stats for the time being. It should also help to boost up your HP. I also had some honor saved up from leveling so I bought the PVP gladiators staff, the alliance trinket, and some kodohide shoulders.
Since then I have been grinding honor for like 2 months, I almost have a full set of kodohide (im at 379 resil). Full kodohide s2 will give you tons of mp5 and something like 800 damage / 1300 healing. I switched to restokin about a month ago, and man it is so much better than straight moonkin, atleast for BGs. Knowing how to evade attackers while healing yourself and dotting enemies is key, and will help alot in arena. Don't feel bad if you don't do much damage, your healing/CC/debuffs/dots will be a help to anyone around you. If it comes down to 1 on 1 I usually go moonkin and Cyclone then time my Starfires to hit at the right second, do that twice then dot and wrath while staying out of range.
Good luck!