First of all Renta is crazy hawt.

Secondly, for hate on NM you can do a few things. First thing you can do is pick up Intimidation from Marauder as a previous poster mentioned. This requires you to accumulate 6,000 marauder guild marks from leves, and then you will get 2,000 from your level 20 Marauder quest which also allows you to purchase the trait.

Also, for multi-mob encounters you can pick up Warmonger from Marauder which you get at level 30. It's an AOE snap aggro taunt with a ~2 minute cooldown, however, it buffs your enmity generation for 30 seconds.

As far as how to hold hate, you can have your deeps wait for you to get 1-2 phalanx off, or....

Throw a dagger to get the hate list built, tag with a provoke and pop outmanuever. That gets you tp for phalanx + blocking, as it is about to drop, sentinel, all the while provoke/feint(lvl 20 lacer). I like to feather provoke and taunts in between so that deeps can go a bit harder on them.

Phalanx + Shield skills + Taunts + Defensive abilities should be more than enough to hold aggro. Don't spam Heavy stab. It's good when you have stamina to burn but you don't wanna be stuck regenerating stam!