The quest is simple. You kill dragons in West ToV and get an Ancient Leather armor piece to drop. Then you turn them in in Kael along with gems.
Check out this site with info:
http://www.eqlunareclipse.com/kael.htm
Getting the Ancient Leather is not so simple. Killing dragons requires a skilled raid of 30 or so people. Most guilds regularly hit WToV until their entire team is outfitted in Kael quest armor. Then they switch to NToV for Skyshrine armor.
Once you've got Skyshrine armor, you are ready to hit Luclin bosses and Vex Thal.
I highly recommend joining a WToV guild if you've never raided before. Taking down 20 dragons in a night is insanely fun.