Ok, imo EC is pretty good xp. You can grab a clarity from a nice enchanter, and then go solo, nuking mobs down (if possible get hp/ds from druid too
[You must be logged in to view images. Log in or Register.]) Basically at the tunnel you have a lot of high lvls who would be happy to buff you for free if you ask nicely.
If you rather group, the xp is probably a tad slower but it will be steady if you just hop into a orc camp group. For faster group XP, you can also find a well geared melee, and duo with them. That is usually better XP than a big group.
Stay in EC till lvl 12 or so, then head to Oasis. You should find a group there pretty easily. You can stay in Oasis till 20-21 lvl.
From 21 lvl, you can go to Upper Guk. If you want to travel to Mistmoore or Unrest you would find groups at either spot who will take you. Both zones have nice Zone Xp modifiers. You also can solo fairly well in Unrest as you have nukes that are good versus undead.