I got you covered. This is how I have my macros set up, and let me tell you I dont have to worry about nothing, no more /assist.

Toon1 (Main)
F1 /focus Toon1
F2 /focus Toon2
F3 /focus Toon3
F4 /focus Toon4

F5 /follow Toon1
F6 /follow Toon2
F7 /follow Toon3
F8 /follow Toon4

Toon2
F1 /focus Toon1
F2 /focus Toon2
F3 /focus Toon3
F4 /focus toon4

F5 /follow Toon1
F6 /follow Toon2
F7 /follow Toon3
F8 /follow Toon4

Toon3
F1 /focus Toon1
F2 /focus Toon2
F3 /focus Toon3
F4 /focus toon4

F5 /follow Toon1
F6 /follow Toon2
F7 /follow Toon3
F8 /follow Toon4

Toon4

F1 /focus Toon1
F2 /focus Toon2
F3 /focus Toon3
F4 /focus toon4

F5 /follow Toon1
F6 /follow Toon2
F7 /follow Toon3
F8 /follow Toon4


So When I'm on my main I hit F1 to /focus my self my alts will then focus me.

I run around and hit keys to cast spells. Now when I hit a key when I have a mob targeted my alt will also cast that spell without having to target the mob

Some macros I use

/cast [target=focustarget] Chain Lightning
/cast [target=focustarget] Earth Shock
/cast [target=focustarget] Frost Shock
/cast [target=focustarget] Lightning Bolt


You bind these to keys on all your characters you will have no problem with playing. This made the game so much easy.

I hope this helps you.