Get your tank to agro the boss in a circle around the room slowly and leave a trail of fire in his path. This may be a bit tricky but it is important . The tank should be careful not to over taunt and loose agro.
Dps should stay in the center and range dps . If you have melee dps they should stay on the side of the boss that faces the tank and do their thing.
Healer should make a point of healing the tank and leave aoe heals in his path.
When the Boss does the cone fire breath attack run or dodge out of the big bad red cone of doom.Healer sould be ready to do a bit of burst healing after .
Or let the tank taunt the boss and kite him around, you gotta put up a speed buff on for doing that. Means no fire, hardly any damage incoming , but dps will have to range.
The way I usually run this as a tank is grab aggro from the boss and just hold him in a corner, dont move and let the healer heal me through the fire the dps keeps ranged so they have ample time to see him target and come running at you for the bite so just dodge roll it. If you have a dk tank all he needs to do is taunt and pop magma armor if the heals are low. I see alot of tanks that keep moving around the room and really you should't have to do this if ths heals are good.