I remember when I was at that level - I just wanted to get to 70 ASAP. So I started the NS and SMV quests as soon as possible. It's really easy to farm gold with daily's at 70 AND there are still a TON of quests to do once you hit 70 anyway. The quickest exp is with the quests to get you to 70 and get your flying mount etc... I had 1000g+ on all my toons at 70 no problem. And that's while leveling tailoringx3, LW, enchanting, gems. Also - I farmed AV to get epic PvP gear - 4 pieces right after I hit 70 to make the instances easier.

I'm not sure what your setup is - but Mana Tombs was my first real instance that I completed. Shadow Labs is a BITCH for multi boxers - especially if you don't have 4x shamans - almost every boss fight requires you to reposition all your guys (1st boss fear, 2nd mass MC, 3rd does the summon, 4th you have to spread out and get sucked in). I'm running pally, 2xmage, priest, shaman.