I can't really give specifics without knowing what happened/seeing you play. Outside of keeping aggro, you should also make sure all mobs are grouped - so take them to the ranged mobs that lag behind, amd that you face mobs away from your allies. Outside of that, its just basic avoidance of aoe's and using skills to mitigate big attacks. The big attacks arent really a worry early though. I know that some will complain about tanks if you don't pull all of the mobs at once to speed things up, but you can just ignore those people.