You can probably do it with all specs, but with combat it goes quite faster, as it is the highest pve dps spec (you can hit 2 mobs at once). So for farming purposes combat is adviced.
You can use that for instance :
WoW Talent Calculator - Sigrie. Focus on white dps basicly this will smoke anything pve wize. Low level of course, don't forget the white dmg is untouched by the "leveling scaling", so it is full throttle, that's why it is the highest dps pve spec at 39.
So the tactics. Basicly you have Revelosh + one heal + one melee and then you have also theses 2 patrols non elite, yeah they are crap, but if you engage revelosh and u get theses 2 boys on top of it, let's say you have not AGM up or not have it at all, that's 5 mobs on your face, that could mean a wipe (a potential vanish, a potential bug then death).
So I have found a way to swipe the 2 non elite mobs at one point, they meet. You see revelosh, there is stairs at his left, and at his right. If you enter the instance right after a reset, the 2 patrol will be right on the right stairs, when you arrive in stealth, you kill them (wont aggro anything), stealth then go for the boss. I usually sap the heal, do the first melee, then kill the heal, while killing theses 2 revlosh will take some damage from Blade Flurry, then kite revelosh behind pillars till I'm safe enought to kill him face to face. (Recuperate up at all times of course) So before you have finished killing the 2 adds make sure revelosh have some mana left...you don't need to kick him all the times to proove yourself you have skills. He will do less damage with his bolts than melee, so use his mana and casts as a buffer to take less damage if needed AND to be able to move behind a pillar, with him not being able to finish a cast, rince and repeat.
If you need more details, don't hesitate, but you probably better give it a try you will very fast, put all pieces together. If you follow all my steps and talents, get as much hit as possible and a minimum health pool, you can kill him with a starting twink gear. As I could basicly kill him free style without any organisation with my best gear. (that is all 5 mobs at once)
edit: miracle, I'm done editing!