DESTROY!!
Basically just do whatt you normally do with more survivability. I found out of all the classes I play elemental shamans move the least in pvp. You're going to use different totems though.
Look it up on wowwiki. It is helpful to keep up grounding totem, healing stream, totem of wrath and tremor totem. If no one is fearing you can throw out earthbind and rain some carnage with your thunderstorm. (In one level)