There are many on the site fellow adventurer! Put "nightblade build" in the search bar and see how you go, failing that hit up youtube

I could give you one but NBs are tough to give builds for because most who play them have different play styles so what works for one is often hopeless for another.

Do some research and if you need to respec you can do so for gold at the respec shrines so save some gold as you will definitely be doing some tweaking!

Good luck