I'm currently running 1 x pally, 1 x shaman and 3 x mages (Ignore my signature! ).

For following with the alts, I use

/target party1
/follow

For sheeping, I looked on the macro wiki and use something like:

Pally's keys:
Alt+1 = Mark current target with skull
Alt+2 = Mark current target with moon
Alt+3 = Mark current target with X

Mage1 keys:
Alt+1 = /assist party1
/focus
/p Sheeping %T

Mage2 keys:
Alt+2 = /assist party1
/focus
/p Sheeping %T



Mage3 keys:
Alt+3 = /assist party1
/focus
/p Sheeping %T


Then all 3 mages have Alt+4 = /cast [target=focus] Pollymorph.

This is all from memory..so some of my macros above could be wrong.. look in the macro wiki.