When you start up have all your clones do:

Code:
/focus <your main's name goes here>
Macro all of your abilities on your clones like this:

Code:
/cast [target=focustarget] fireball
Replace "fireball" with whichever ability. Once you understand how this work then you can start moving to more advanced features like defaulting to your current target if a focus is not assigned or switching your focus when your main dies etc.