My post maybe a little late... but I can give you some helpful tips for playing resto. The main spells that I cast a lot are revj, swiftmend, and regrowth.
-Revjuvenation: HoT, doesn't stack, but allows you to cast Swiftmend
-Swiftmend: An awesome, instant cast healing spell, it also heals the 3 most injured allies that stand in it.
-Regrowth: I quick powerful healing spell (costs quite a bit of mana)
I use some lifebloom but not much, same with wild growth. Why? Because they don't heal much. I still use those, but not as much as the 3 above. Even when I stack Lifebloom, (can be stacked up to 3 times) it doesn't heal that much, but it's still good to stack lifebloom once you begin an arena. Healing Touch takes a long time to cast, but I still cast it, but not much. Also have ways to escape from my enemys:
-Cyclone: Target gets trapped in a tornado, they immune to attacks though
-Nature's Grasp: Roots the target when they hit you (because of that spell, I don't use they other rooting/snaring one)
There are some helpful talents for resto as well, on my resto, I have Nature's Swiftness and Incarnation (Incarnation is AWESOME!)
-Nature's Swiftness: Makes Healing Touch, rooting spell (forgot what it's called), Regrowth, Nourish, rebirth, and quite a bit of other spells instant, castable in every form, and cost no mana
-Incarnation (tree of life): Makes Regrowth instant, causes Wild Growth to heal 2 other most injured targets, and makes the root spell (forgot what it's called) instant.
Those are all the tips that I know, Good luck with arenas! :)
Edited by Honeydrop on 8/7/2013 4:15 AM PDT