I did a lot of research on the issue but I haven't actually played all the styles.

What race are you? Khajiti?

Typically it is Dual wield and Bow.

A basic build is Hundings rage and Spriggans or Nightmothers Gaze and Spriggans. I believe Nightmothers does more damage but Hundings rage gives more sustain. So If you are just running around solo go with Hundings rage.

For ganking you need a proc set, Viper or Red mountain then Selenes or Velidreth monster helm. The other set, I have spriggans, but I have heard people like clever alchemist. You can go dual wield or 2h or bow choose 2.

For dual wield is is Flurry for single target and Whirlwind for AoE.
For Bow you run Volley, poison injection and maybe snipe.

As for your NB skills.
Ambush, shadow cloak, veiled strike , killers blade, Grim focus, Aspect of terror, Siphoning strikes. Then take the stamina morphs when available.

Ultimate
Death stroke or Dawnbreaker.

Utility
Shuffle and Vigor.

Obviously not all of this will fit on your bar, so try them out and decide what you like best.

Thief or Shadow stone.