New to pvp. Resto druid.

Hey there, i´m complete new tp pvp. I play druid since about 15 years, but never touched pvp. Now is the time. I almost play everything solo as a healer or guardian. It´s not so that i get totaly wrecked every game, but i heal like 5-7 mio and the other healer has about double that.

So i would love to get help from pvp healers, how to get better. where to gear, how to play, what spec i should use...is full honor gear worth it? thx!