1. Night Mother's gear gives lotsa crit, however crit now less effective (damage-wise) than weapon power. Hunding's 5-piece bonus makes it a very viable set. Got take a look at Fextralife's wiki and find a replacement for Night Mother's. Morag Tong items and Shadow Walker rings will help you maximize your weapon power.

2. 60 points stamina - I bet you are super-squishy. Nowadays, 20k hp seems to be the minimum health pool to prevent getting 1 or 2-shotted. Moreover, having a massive resource pool is less important than it used to be. Without softcaps (removed in patch 1.6), it is extremely easy to achieve high regen stats. You can rely on this regen to continuously cast skills, and you can forego the nominal boost that extra stamina gives to weapon power.

3. Stamina regen on you jewelry - Reduce cost is much better for managing your resources than stamina regen.

As far as NB specific skills & setup are concerned, my V1 NB toon doesn't make me an expert, especially when ganking. However, the 3 suggestions above should help immensely. The more time you spend in-game, and thus the more champion points you earn, you will achieve better results both offensively and defensively.