Green golem has to die first, don't feed it any meteors unless there are ones nearby. The reason being is that if you move green too much melee dps won't be able to hit it as much, and you might accidentally cleave someone by moving or losing aggro.

This is what I recommend you do as it's what I do every time I try to learn a new encounter.

Look up MTQ's video guide, and then look up a POV video on the class that you intend to play. Since you're a tank just type into youtube, "T9 Tank POV" and you'll get a lot of results.