Talent Choices:
Level 15: Hemorrhage. Increases Bleed Damage by 25%, no brainer pick.
Level 30: I prefer to use Nightstalker, 20% movement speed increase and 50% Damage increase while stealthed is nice. the 4 PC Rogue set gives you 5 CP on Vanish. Will probably change in legion.
Level 45: Vigor. Increase your energy pool by 50 and regeneration by 10%. You don't need the other two because you're not going to be overcapping combo points in this spec.
Level 60: I prefer Elusiveness over Cheat Death because having a 30% mitigation on button press is more valuable than a 85% reduction every two minutes.
Level 75: Internal Bleeding. It's a bleed. Does more damage per combo point spent on it. Class fantasy yo.
Level 90: Exsanguinate. Twist your blades into the target making your bleeds tick 400% faster. Pretty freakin' brutal.
Level 100: I love Marked for Death. I probably wouldn't use Death from above or Venom Rush. Marked for Death has more utility than both.
Opener:
Works both on melee and ranged:
Garrote > Hemorrhage > Mutilate to 5 CP > Rupture > Marked for Death > Kidney Shot > Exsanguinate. Pop Vendetta > Vanish and get 5 CP (providing you have 4 PC set bonus) > Envenom. After that, keep Hemo and Rupture up while using 5 CP Envenoms.
You might need to delay Kidney Shot if the opponent is stun immune. Everything is situational.