I just hit 70 with my feral druid and am switching to Resto for BG's then Arena.
As of yet I have not tried the resto spec at all so I know it will take some getting used to.
My question is how do you do damge while resto?? Switching to bear form and popping out to heal or just wrath/moonfire with cyclone and roots for healing?
Or is it just best to make sure you are never alone and can heal yourself and a damage dealer to take opponents out?

As resto druids do very little damage.  Really your best chance though is to have some one near you deal damage while you heal.  However if your bent on dealing damage i would spec for insect swarm that way you moonfire swarm and do ur heals. It's just nice to put a little dmg on the charts.