This can be a rather hard fight, many times the guards can wipe players.

Abilities

Heal: Sulfuron's guards will heal eachother if they are not pulled a ways away from eachother.

Shadow Word: Pain: Sulfuron's guards can cast SW:Pain on players, this does a very high amount of damage when it ticks and should be dispelled as soon as possible.

Immolate: Sulfuron's guards can cast immolate on players dealing 400 damage every 3 seconds, dispell this.

Pull

Your MT should run up and tank Sulfuron back a bit from where he is standing originally. The guards need to be pulled to opposite ends of the room and kept seperated lest they heal one another.

Fight

Your first objective is to focus fire the guards, they are pretty deadly so take them down one at a time first. Have your dispellers ready to get rid of SW:Pain if it pops up on someone, it can easily kill your healers/tanks.

Once the guards are down just beat on the boss, he dosen't do much by himself so once the guards are gone it's a rather easy fight. This boss is known to drop the infamous "Vendorstrike" AKA Shadowstrike.

Good luck.