This article will explain what nameservers you need to use for your dedicated server.
You can use your own domain name as your nameservers by setting the following DNS entries for your domain name:
ns1.domain-name.co.uk
[[Primary IP Address]] of your dedicated server that was provided in your welcome email.
ns2.domain-name.co.uk
[[Secondary IP Address]] of your dedicated server that was provided in your welcome email.
For more information on setting your DNS entries as the dedicated server IP Address please contact your domain name provider.