shaman dps, stop heal, cont dps macro

[Cypress]

Did I mentioned I was noob

What is GCD? I did a forum search came up with nothing.

But it looks like i cannot quite do what I want to do. Got any recommendations on how I can heal my tank. I like the idea of having 4 elemental shamans as back up healers and no designated healer. I find it hard to tank and heal from my paly. Maybe when I get higher lvl i will not need as much healing because of totems, but now I need it to survive

I was hoping i can control the heals but I will be happy if I can do something like:
instead of
/cast lightning bolt

to something like : cast 3 bolts change target to tank, heal, reset (back to mob) and rotate over shamans so someting like

shaman1
/castsequence lightning bolt,lightning bolt,lightning bolt, [target=party1] Healing wave
/assist party1

shaman2
/castsequence lightning bolt,lightning bolt, [target=party1] Healing wave
/assist party1
/cast lightning bolt

shaman3
/castsequence lightning bolt, [target=party1] Healing wave
/assist party1
/castsequence lightning bolt,lightning bolt

shaman4
/target party1
/cast Healing wave
/assist party1
/castsequence lightning bolt,lightning bolt,lightning bolt

not sure if this will work, i gotta test it, but something is nagging me if i can use cast and castsequence that way