Your alt will need to run past 85-86 level mobs to get started farming. I'm not sure if you can summon a lower level toon to Pandaria, but Farmer Yoon's quests to start up your farm are level 85 and above, so your toon will need to be at least 85.
First, your alt will have to get to Pandaria through your faction's quest. You'll need to complete the vehicle quest, whether that's shooting Alliance troops from a turret or shooting Horde troops from a helicopter. Then, you should be able to drop to the ground via a rope and continue the rest of the way to Halfhill on mounted foot.
Filed under: Mists of Pandaria