Ok. Im tired of being a leecher, so ill try to contribute.
Most of you might now this "Campforge: Hate" in Nagrand. Usually people stay away because: "Oh noes. It is lvl 67+ elites! I dont got a chance!". But as Warlock, you DO! Your ability "Enslave Demon" is just gold worth in this case! Go enslave one of the Felguards, and have fun! The Felguard got about 32k HP, hits for around 1k, and critts for around 1,5k.
Farm the elites, and non elites here. I am a lvl 66 Warlock, and I get 5k XP per elite. And it is fast to kill them! Stick to the engineers though. (Cant recon name, but they look like some kinda engineer). They have the lowest HP = They are the fastest to kill.
And whenever your enslave is about to run out, go away, and get ready to kill your felguard. They are fear-able! Make sure your Felguard is under 10% HP.
This trick can also be used to do the grp quests. Just enslave, mount up, and run over to the mob you need to kill
Have fun out there!