New To Tanking and Have Some Questions.

[Twilite]

Have provoke in the first slot. Don't want level sync to troll you one day and be without Provoke.

Switch targets regularly to check your healer's enmity bar on all of them. If the bar is nearing half or above half, batter it down with your aggro combo. Healing aggro in the beginning can creep up on you faster than DPS aggro. If you can't make it to all(because GCD) use overpower or flash. Also do this for DPS that isn't attacking what you're attacking. Most prefer to attack what you're attacking(and should as it helps them manage their own enmity) from what I've experienced. It doesn't hurt to double check to account for lag.

And if healer pull aggro, I use this when I don't want to move from my spot: Provoke > Tomahawk > Overpower when in range > aggro combo. Generally, you always always need to follow up provoke with an enmity combo or skill.

Pulling: You're gonna be stuck with foresight as your only form of mitigation in the beginning..and it sucks. Once you get vengeance and inner beast, pulls and other situations become easier.

Defiance: Level sync turns this off by default. Remember that.