To create your own and personal nameserver, you need to do the 2 thing:
1. Create/Register the nameserver in your domain control panel with the 2 IPs that are assigned to you. If you are unsure about this, please contact with your domain provider.
2. Go to WHM and click on Basic Cpanel & WHM Setup and scroll down and find Nameserver section. Fill in the nameserver with the IP assigned to you
Allow up to 24 hours for the propagation to take place.