Double Enh shaman. Massive burst and self healing. Totems for oh shit moments, and you can go caster or double healer. Might even be able to run RBGS as that set.

Locks and hunters are awesome, but have a lot of abilities. Both are getting the nerf bat in 5.4. Locks are the best flag carriers in pvp right now, which defies logic.

Its always been Prot pal x 4 shamans. I myself run multi group comps, but its best to start on something you will be somewhat effective. The part that people dont mention to you right off that bat with boxing is that you will be drowning when you dive right in. Yes there are resources, guides, videos, posts, etc. But none of that will come close to anything but the real experience. What seems so simple can turn in to a nightmare in seconds with a stuck broadcast runner etc.

Go with the easiest mid road class(shaman), and start having fun learning. Which may not always be the case. Trial and error. You are about to drop into the most interesting gaming community, and you will have to earn it.

Keep your chin up and broadcast all off.