PVE, resto shaman and protpala?

Hello, I'm back again to try on new.

http://armory.wow-europe.com/charact...ol&n=Hellbreak

This is my shaman, I did level a paladin before to 44 running behind with a druid hotting.
I am still not sure if I'm going to make 2 new chars or keep on with my resto shaman, I'm running a Ubuntu pc, thinking on running both clients on one pc. Make focus on both windows or something. Its gonna be hard because you don't need to push as many buttons on the healer as the tank, not sure how I'm gonna coordinate this. When I leveled the paladin last time I swapped windows or used 2 keyboards, and I gave up because it got messy. The healing would be easy with resto shaman (pewpew chain heal), that is in targetting and healing.

I will need to function like in a normal group.
If someone have done this before, please give me advices I know that most dual-boxers use 2x dps, not sure if 2 dps is the right choice for me.