Right now its pain stakingly slow to grind as a resto druid in 2s. I'm looking for some advice/ tips about the beginning of the fight.

It seems to me that if we can survive the first 40 seconds of battle then we can win the match. Any tips to not get seen initially, should i play offensively with cyclones to start out, etc

Also, what class is best? I've played with a hunter/ret/rogue/lock. I kind of like the options that each provide, with locks being my fav 2s partner, but I'm willing to do anything, because for every 4 steps we take forward, it seems one loss negates the effects