Well, lightning bolt is your main damaging ability and it's 88% of sp, so you're gonna hit like a wet noodle as ele. Better idea to go enha, resto or roll a different class imo.
As mentioned before, enhance is your best sham dps option. Heals are fine, but sadly limited due to shit mana regen. Very versatile with heals, burst, sustain, dots, shear, purge and excellent mobility and slows. I suggest stacking versatility, and a buttload of agi/AP.