If you are looking to create private nameservers, you could create ns1.mozkrat.com (point to first IP of your vps) and ns2.mozkrat.com (point to second IP of your vps) at your domain registrar, and then add this namesevers to your cpanel DNS setup.
(takes 24-48 hours to propagate)
You can then point all domains to these nameservers you wish to host it on your cpanel vps.
xtrac568 is correct about creating private nameserver, what is your control panel are you sure you have bind installed on your VPS? note that it can take around 12-48 hours before your DNS changes to propagate.