Going 5 box soon

Hey guys well i just got order my new radeon HD 5750 as of now i am triple boxing 3 shamans but i was tired of looking for people to party with so i decide to get a pally&priest in there play the pally tank as my main char and other slaves since my Graphic card cant handle 5 boxing i bought the 5750 and extra ram of g skill which works nicely heres a list of things i need some help with just don't wanna be confused.

1. Tank Macro For Pally
2. Healing Macro/Dps For Priest will be holy
3.DPS macro For Ele Shaman

This is something I've never tryed befor but i always thought of now i cant wait to solo instances and get going with my magic macros :D thanks guys all your help is appreciated.

4GB
HD 5750
AMD Athlon 64 X2 2.1GHz 2 "Should be upgraded" im aware.

You'll need a software option, to broadcast keys to your other clients.
Well that or hardware and multiple machines, but most go with software.
I really like IS Boxer, but there are a lot of options.

Drive with your tank.
The pally will have a "96969" macro, which is just weaving three 9 second cooldown abilities, with 2 six second abilities, into a sequence which runs each ability twice.
That's strong tanking for both single target and multi-target pulls.
Have Avenger's Shield (pulls), Divine Plea (start of combat) and a couple situational buttons separate.
Thinks like Divine Sacrifice, Hand of Protection and the 3 mob taunt, although you won't use these much.

Figure a way to heal efficiently with the healer.
If you go with IS Boxer, look into repeater region heals, nothing beats that, imo.
Otherwise, have macros where the healer will cast "x" heal on the toon specified (as in one macro for each team member).
And then have a couple assist based heals.... /assist tank... /cast [help] heal; [help, target=targettarget] heal.
Change the word "heal" to the heal spell of choice.
I'd recommend Disc over Holy, for healing.

And create macros for the DPS.
Check the wiki, or Fursphere's thread for 3.3 elemental click macros.
Or Jafula has a thread, for click macros.

And decide on classes, which have some kind of synergy together.
It sounds like you have a good idea on this front.
Pally tank, Priest Healer, DPS Shammies.