There are three kinds of WoW Cataclysm Classic Gold mobs that appear in this stage: the humanoids, the big gap Sentinel and the smaller Void spawns which appear after you kill the empty Sentinel.
In essence, you should focus on killing the void Sentinel and then the void bonds, followed by the humanoids and finally Nouriel but there are some strategies that you can try to use to make eliminating the happy crowds easier.
First off the humanoids will always appear in two groups of three at the beginning of the room as well as on the opposite side where the ramp to kill Jaden is located, so you should have two things stood at either side ready to grab them prior to the gap Sentinel spawns there will be a large portal that indicates where it will spawn.
It's highly recommended that you have a broad paladin tank this one and keep it close to the raid, but in no way too close. The reason is that when the Sentinel is killed, it creates five void spawns. These can and should be enslaved Warlocks for at least the initial batch should they be needed. The rest need to be killed quickly however, you should never let the big empty Sentinel run into Buy Cataclysm Classic Gold the race as it's an AoE that can cause people to start dying extremely quickly.