With Jamba, I open the window on the main toon, then open the window on all of the alt toon's screens.
Once every toon has the window open, I make a selection with the main toon's window.
Since all my toons are the same class and level, I have the slave toons set to mirror the master in all situations.

For Jamba to work, you need to make sure all of your toons are checked in the Jamba main window.
The easiest way to do this, is for each slave to have itself and the master toon on its list, with the master toon selected as master in the drop down field.
Then have all toons added to the master's window, and use the push button, to send settings to all the other clients.

Assuming you have all the clients selected on each wow window and its not working, you'd probably be best off posting in the Jamba thread, which is in the macro/addon's forum.
Jafula maintains a thread for her addon there.




I'm assuming your team will be two toons, from your first post.
A healer toon and a tanking toon is a good option.
A deathknight and healer could work really well, DK's seem to put out very nice damage.
A shaman's totems could really help them... Strength of Earth, Windfury Totem, Flametongue Totem, Healing Stream Totem.... Earth Shield on DK, Water Shield on your healer.

Two ferals could work quite nicely. Follow breaks when auto attack begins, so charge in and attack, then move the non-bear behind the mob to cat dps.
Cat toon will have less threat and can heal.
After so many fights, if mana is an issue, you can easily switch roles for a bit.
And you'll have two innervates as well.

Two ranged dps of any sort would be fine too.
Mages for example would use half the mana each, since two are casting.
So you would go twice as many fights before needing to break, and both would regen mana at once.
Instead of one regening from 0 to 1000 mana, at 1 increment at a time, both regen from 500 to 1000 at 1 increment each. Half the down time too.
With two toons, you can take harder things or plow through normal things very quickly.
Two hunters could be a good option, one BM for the tanking pet the other either BM or MM.

A lot of options.





*Edit*
Two warlocks...

/castsequence Corruption, Curse of Agony, Siphon Life
/castsequence [target=party1target] Corruption, Curse of Agony, Siphon Life

/castsequence reset=x/target Immolate, Incinerate
.... where x is the duration of Immolate.

/castsequence reset=45 ,Howl of Terror
/castsequence reset=45 Howl of Terror,
.... for two AoE fears... instant with talents, strong regardless.

/castsequence Death Coil, Fear

/cast [nochanneling:Drain Life] Drain Life
... spammable Drain Life macro, which won't end drain life if you're casting that spell. Can adapt to drain soul or drain mana too.

#showtooltip
/cast [nochanneling:Drain Soul]Drain Soul
/script PU=PickupContainerItem; D=Delete CursorItem; PU(4,27); D(); PU(4,28); D();
.... This one assumes you have a 28 slot shard bag in bag slot 4 (far left bag... default backpack is 0, counts up as you head left)
.... The macro will pick up your 28th shard and delete it, which means you'll never have more then 27 in that bag.
.... If you spec'd into improved Drain Soul and use it on almost every kill for the mana regen, this macro prevents you from filling up every bag slot with shards rapidly.

/cast [pet:voidwalker] Sacrifice
/stopcasting [pet:voidwalker]
/cast Fel Domination
/stopcasting
/cast Summon Voidwalker(Summon)
.... If you have a Blueberry out, it is sacrificed on the first click and Fel Domination summoned again on the second click.


Primary:
/clearfocus [target=focus,dead]
/cast [pet:succubus,target=focus,harm]Seduction; [pet:succubus,target=mouseover]Seduction; [pet:voidwalker]Suffering; [pet:felhunter,target=mouseover]Spell Lock;[pet:felhunter]Spell Lock;[pet:felguard]Intercept

Secondary:
/focus [pet:succubus,harm]
/clearfocus [modifier:alt]
/cast [pet:felhunter,modifier:alt,target=p_layer_]Devour Magic;[pet:felhunter,target=mouseover]Devour Magic;[pet:felhunter]Devour Magic;[pet:voidwalker]Sacrifice;[pet:felguard]Cleave

These two duplicate the Servitude Addon. On my warlock I have them bound to forward and backward thumb mouse buttons.
Voidwalker can AoE Taunt/Sacrifice. Felhunter Spell Locks/Devour's Magic. Felguard Intercepts/Charges.
Succubus seduces focus/Focus is selected.