Coming back to multiboxing. But am unsure of what to make. I currently have a mage, shaman, dk team

Thoughts...
Hunters-Range
Boomkins-Dmg
Ret pallys-enough said


(SIDE QUESTION; I keep getting D/C when playing in battles ill get D/C even if only on one toon. I have my NUM9 keybinded as my move to target button. It's normally what ill spam to get to my target...) ty