Are any of you guys in the same guild?

If there isn't one already, and if there's enough interested in it, why not?

You don't always have to do all the quests at once, if you do the zonal quests, dailies, dungeons, or warfronts, you will most probably outlevel the contents. That being said, you can always mentor back down to the appropriate level to do those quests that you have missed.

Farm planarites and buy the 6 slots essence from planar vendor in your respective faction town (sanctum/meridian).