In reply to the original poster, selecting from:

1 x 80 Paladin - Soap
1 x 80 Druid - Ghør
1 x 72 Shaman - Ghur
2x 70 Shaman - Zubwan & Zubtres
1x 70 Rogue - Wazza
1 x 70 Mage - Frizza
1 x 70 Warrior - Shaiah
2 x 70 Priests - Cian & Cixi

If you have your heart set on two teams, each will need a tank, a healer and three dps. You have a lot of healer and dps options, but only three tank options.

You will need to use the Click to Move and Interact With Target, because of the Rogue.

I'd actually go with a predominantly Caster based group 1, and a predominantly melee based group 2, just for the variety. The pally is the best tank for AoE and a caster based group (imo), so I'd split them like this:

Group 1:
Paladin - Tank
Mage - Frost
Shaman - Elemental
Shaman - Elemental
Priest - Discipline

Group 2:
Druid - Tank
Rogue - Combat
Warrior - Fury
Shaman - Enhance
Priest - Holy

Really, its personal preference, just about any configuration will work, provided each group has a tank, healer and three of the dps. I'd personally go with Click-To-Move & Interact-With-Target, entirely in one group, to make it a bit easier on yourself. The two groups will play very differently.