It pleases me to see you've arrived so quickly, <name>. Welcome.
As you've probably heard, all of Teldrassil is stirring with the comings and goings of travelers. Even members of the Alliance have been allowed access onto Teldrassil's boughs in order to meet with other Kaldorei who prepare for the adventures ahead.
Do not concern yourself with the world below Teldrassil for now. There will be time for that later. Go now and speak to the others in Shadowglen--they can tell you more about what events have transpired. Help them in any way you can, and anytime you feel you need more training, come back to me and I will teach you what I can.