You’ll need to be at max level and have the WoW Mists of Pandaria patch (5. 2) patch to get to the Isle of Thunder.
If you are Horde, go to 50. 7, 73. 4 to find the quest giver. If you are Alliance, you’ll find the quest giver at 49. 7, 68. 7.
You only have to do this one time—after finishing the quest, you’ll be able to take the portal to the Isle of Thunder from Shado-Pan Garrison. [4] X Research source