Fresh 90 Resto Druid PvP advice
Arena healing, like arena DPS, is all about the burst and cc. You will most likely want to use Displacer Beast, Incarnation, and Heart of the Wild for three of your talents, and the others are up to you. I prefer Nature's Swiftness, Typhoon, and Disorienting Roar for PvP, but cases can be made for others. As far as glyphs go, Barkskin, Lifebloom (the swapping one), Blooming, Nature's Grasp, and Regrowth (very potent with Incarnation) are some of the ones I swap between, depending on what type of PvP I am doing.
For healing, I try to keep Lifebloom x 3 on the person being focused, Faerie Fire on the current DPS target, and Rejuves on all team members at all times. Emergency heals include Swiftmend and a macro of Nature's Swiftness + Healing Touch. Wild Growth is a counter to AoE, or multi-DoT classes (DKs). Learn what the various classes can do to your partners, and which of these should be dispelled immediately, and which are relatively harmless. And last but not least, you should be using both Barkskin and Ironbark pretty much on CD.
As a druid, you will need to master more than just healing, as our signature in PvP is our mobility and general runawayiness. Get used to shapeshifting, rooting, and cycloning people, as you will be using those very often in arenas. Faerie Fire on rogues is a must. You will also be able to cast Symbiosis on a teammate (must be recast each time you enter an arena, so don't forget). My favorites are Hunters and DKs, as those give you Deterrence and Icebound Fortitude respectively. What classes do you plan to run arenas with?
Although BGs are the traditional way to learn how to PvP, dueling someone is a great way to practice both your heals and your escapes. If you plan to do arenas, duel your arena partner.
the fastest way to gain honor points, instead of actually doing BGs is to to queue up for heroic 5mans, get justice points and then convert them to honor. believe me, as stupid as it is, it's much faster. Plus, you'll learn more about resto in a more controlled environment at first.
From there, you can focus on learning the finer points of druid PvP -- such as CC, escapes, when to shapeshift, etc.
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