For Rotation:
Raid Healing: Ch, Ch, Riptide, Ch, Ch, Riptide, Ch, Ch, Riptide.......
I do this to keep the tidalwave buff up in the event I need to dump a LHW or HW on a tank to help the haste bonus is nice plus RT is fairly mana efficient and its guaranteed EH if you use it properly on a low life player. I generally dump it off on a low priority player who I know most other healers will ignore, this gives me the full benefit of the ticks after the initial surge.
Tank Healing:
It's highly dependent on the encounter. If there are melee around taking damage to soak CH jumps use CH unless the dmg is so great you need more heal per cast for the tank ur given. in which case you go to spamming LHW w/ LHW glyph and earth shield on the tank. Keeping ES up and Riptide going to buff your cast time on LHW. I rarely if ever use Healing Wave atm, and due to the stacking nature of healing way i dont even bother with the talent. Hell I doubt ill pick it up even after the change, I just dont single target heal enough to warant the waist of talent points.
As far as other tips.....
Im not sure what your gemming strategy is since you only have 1 item you can gem but take a look at the Shaman thread over at EJ. INT is pretty much the standard gemming practice for any gear set, its good in pretty much all situations.
Here is a WWS parse of a raid I was in a few weeks ago to give you an idea of spell usage I have myself...
http://wowwebstats.com/qir1f5pgwv53a?a=x261d09c