Properly Name Servers Configuration ( + issue explanation) on a new WHM with many cPpanels.

I have issues with my client new WHM server. I need someone to properly configure the Name Servers for the WHM in a way that they work for all the cPanels inside too and could be setup for each of my Domains.
I need it done through ANYDESK + I need the issue explained in the way to don`t encounter it again.

I have all the WHM and my domain registrar access.