You’re mid-leveling so it’s not really a build. But here’s some advice.
Have a vision for the build. One damage type and as much resistance reduction as you can get. One or two main sources of damage. Prioritize gear drops that give you resistances, you need to get to 80% and beyond on every one of them asap. Have a source of sustain (healing), ideally “attack damage converted to health” (adcth) and skills that deal weapon damage (pick up Ghoul devotion asap).
As for where to put points, search the forums for cold Shadow Strike builds and see. I think you’ll find some links here Any good shadow strike build left?