Oh also this guide is kinda alliance sided so ill throw this in for the horde. The horde starting point if unlocked already is on on the pyramid in zandalari. From a goblin npc named Gazlowe. Hes on the same lvl of the pyrimid that the portal room is on but outside. If your outside looking at the entrance to the pyrimid where the portal room is you go to the left to find him. He gives the starting quest "The Legend Of Mechagon".