Life surge with Full Thrust is good! Fracture isn't really a good cross-class skill, or atleast I haven't seen it become such. I know it wasn't in 2.x and I haven't seen any talk about it being useful here in HW.

Up until you get Chaos Thrust it will mostly just be keeping up the Heavy Thrust buff , Disembowel debuff and Phleg DoT on the enemy, and otherwise FT combo. Once you have Chaos Thurst it'll basically be Heavy Thrust, Chaos Thrust combo, Phleg DoT, Full Thrust combo. Use oGCDs when they are up/appropiate (For example, if I know there is a regular time for Adds to come up during a boss fight I may try to save Spineshatter dive to get to them quickly if its something I should be dealing with.)

Things will change a bit more going to 60 with the newer skills there, but so far it seems to mostly be similar to the 2.x version. Also if I am wrong on anything someone better versed in this will hopefully correct.