For money and ease there are lvl 68 dailies in Howling Fjord. Get 3 people doing 2 dailies there takes like 10 mins (air ship) and 3 mins (steelgate) and you get about 4-5 each quest and each person. That adds up real quick. Then once you get to 73, you can do the Grizzly Hills PVP dailies. That is 4 of them, and they take 4-5 for one and then 5-8 mins for 3 of them, so for 5+8+(5 mins travel time)=18 mins total, you get 3x5g=15g. That isn't so bad. And it is doens't involve any real fighting. You could do it solo (just watch for gankers on PVP stuff).

I would just get all 4-5. Go level up the lower people when you can, but put the higher people outside of your group (so they don't destroy the exp) and do quests on the lower people. You might do a few instances and see if it is worth it (time versus exp compared to quests). Go do the dailies on the higher people. And watch LFG chat and be willing to do instances with other groups on your lower people, since everyone near your level makes exp better. Doesn't even matter if they are idiots, you don't need to finish the place, just get the exp off the trash mobs.
Hope that helps and good luck.