It's pretty simple, we're just going to stick to a pretty solid rotation and there isn't a whole lot more too it. Your top two abilities are going to be Rail Shot and Immolate. These are your two hardest hitting shots, and they also have 15 second cooldowns you'll have to wait on giving you time to use other abilities.

Once you've used both of those you aren't going to just sit around and wait 15 seconds, so you'll want to use an Explosive Dart, followed by a Rapid Shot, next use your Retractable Blade, and then a Rocket Punch and a Flame Burst. At swtor credits cheap this point you'll be able to use your Rail Shot and Immolate again and be back at square one and just need to keep repeating this.