I have 4 Shamans and 1 Mage that are all currently 62.
I got to outlands at 58ish and have almost all of hellfire complete (except the instances)

Currently my specs are:
4 Shamans : Full Elemental
1 Mage : Full Fire

Should I be grinding instances (like Ramps?) or should I be continueing to quest (which seems very slow). If I do instances should I swap my mage over to arcane due to agro issues (she makes a horrible tank at the moment)

Should I be grinding quests in another zone? what zone order should I do? The only quests I know by heart are Hellfire / Nagrand.

My plans were to level in outlands till 68 then switch over to northrend, unless there is better options out there.