I've tried Draenor before. There really aren't many people on either side... Lots of p2p twinks, barely any f2p twinks...
Try rerollin' a Alliance character on Twisting Nether. There are already lots of people here. Plus, AGM ain't impossible over here. It takes like 2 weeks (without having to wake up at 3/6am).
But you mentioned about playing Horde. If you wanna continue playing Horde, then try going to Aggramar. They have a great Horde f2p community with some genuinely nice people. Not sure about AGM over there though...