resto arena heal managment advise needed.Follow

I am starting arena and tonight played 50 games with my rogue real life friend.
We are not at about 600 rating won just over half the games and I have learned alot however I would like some advise.

What I have been doing it keeping one stack of lifebloom (letting it bloom), rejuv and regrowth on partner or me when under fire. Is that enough, or should i use more than 1 stack of Lifebloom.
I would guess a well geared druid would just need the above and when that is not enough then the team are too well geared. So when do you know that their dps is too great.
I know I could spam heal with nourish but run oom faster. I really have no clue about how to manage the hots and non instand heals.
Do use 2/3 stacks of lifebloom when running away from enemy but is this the only time to use it?

Thanks in advance, this was not well written thought I hope you got the jist of what I am asking about.