This is a pretty simple build. You literally just run through your rotation which will give you a combination of direct, single target damage as well as some AoE damage. Some of your healing comes from Draining Shot and Relentless Focus (or Merciless Resolve, if you want more healing) so make sure to use the rotation as the first four skills will set up Relentless Focus. Of course the bulk of your healing comes from the Ring of Pale Order so it's important to keep attacking. The more you attack, the more you heal.
It's also important to use Twisting Path as that not only acts as an AOE damage source but also triggers the Shadow passive, Shadow barrier, which provides you with Major Resolve.
The back bar is used to slot skills that provides bonuses no matter which bar they are on, including the Ultimate, however you could add some other skills in addition to those if you want to use the back bar in a limited capacity.