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Forgive the Copy and Paste from Wowhead.com but this is the easiest way to give you the info you need to start trashing some mobs.   Recommended Gear Score for The Forge of Souls on Heroic is 4000, though you could go lower if other members of the group are better geared and have experience.  This is just a suggestion.

The Forge of Souls is the first wing of the dungeon complex known as the Frozen Halls, located within Icecrown Citadel. The instance portal is located to the left inside the secured area of Icecrown Citadel, near the meeting stone. No attunement is required for entry, but completing the instance is required to gain entrance to the Pit of Saron.

Bronhahm, the Godfather of Souls, is the first boss in the Forge of Souls. He oversees some of the most disturbing devices the Scourge engineers have ever created – the Soul Grinders.

Overview

The fight against Bronjahm has two phases. In Phase 1 players have to weaken him and destroy the Corrupted Soul Fragments that Bronjahm separates from players. These Soul Fragments hover towards Bronjahm and heal him if they arrive. The affected player which Bronjahm is channeling the spell on should try to move as far from Bronjahm as he can in order to maximize travel time of the Fragments.

Phase 1 ends at around 30% with Bronjahm teleporting to the center of the room. From here he will cast a constant vortex that hurts anyone on touching or even crossing the boundaries. Players will have to stay near the inside of the room to avoid being hit by it. He will periodically fear a player through the vortex, so healers will need to be sure to keep players topped off and be attentive of which player is feared.

The Devourer of Souls is a being of unknown species, the second and last boss in the Forge of Souls. It also guards the Crucible of Souls, needed to temper Quel’Delar.

Overview

The Devourer casts Phantom Blast constantly on the main tank if he is not performing another ability.

Frequently he will jump to another player in the party and create a Well of Souls on the floor. The well will last up to 15 seconds and does intense damage to anyone standing in it.

“Devourer of Souls begins to cast Mirrored Soul!”

Whenever Mirror Soul is active, any damage done to the Devourer will be mirrored to whoever has the debuff. Therefore it is crucial to stop DPS while it is up.

“Devourer of Souls begins to Unleash Souls!”

Another ability for the Devourer is to stop whatever he is doing and summon a very large number of wraiths. They do not hit very hard but there are a lot of them and they cannot be targeted. Start running away if the damage starts becoming too great.

“Devourer of Souls begins to cast Wailing Souls!”

Finally, the Devourer will unleash a wail of souls. This is a 90 degree sweep of the room (either clockwise or counterclockwise) starting from a position selected at random. The wail starts about 3 seconds after casting it and will wail for 15 seconds. Anyone caught in the wail will take a very high amount of damage that ticks every 0.4 seconds.