Instance Quests:
Scarab Shells
Troll Temper
Tiara of the Deep
Nekrum's Medallion
The Prophecy of Mosh'Aru
Divino-matic rod
Gahz'rilla

Zul'Farrak is a lvl 42-50ish dungeon located in the top left corner of Tanaris. Not to hard if your group is good.

The first part of the dugeon is easy having 2-4 elites per pull if you have a mage/rouge you can take 2 of them out of the battle for a while with sheep and sap. Eventually you will reach a area with alot of small bugs.

In this area is a mini-boss Theka the Martyr who is not very hard but becomes immune to melee and shadow damage at around 20% HP.

A bit after the Theka room you will be in a area with Witch Doctor Zum'Rah who is a bit hard the first time as he has help. If you have a good group this shouldnt be a problem.

After the Witch doctor as you continue on you will come into a large open area with a huge temple. This temple is where you do the Divino-matic quest.

To get to the Chieftan you need to keep the goblin from the Divino-matic quest alive so he blows the door open. You can also go down the other path from this area to find where you can spawn Gahz'rilla.

The room where you do the Gahz'rilla quest has a large pool in it that if you drop into it should keep mobs from killing you. Clear the room then hit the gong and slay Gahz'rilla.

Now proceed through the door the goblin blew open and clear the room with the chief in it. The chief has a guard called Ruuzlu who paired with the chief can be deadly. This fight can be rather hard but if you beat everything else you can do this.

Once the chief falls you have finished Zul'Farrak