Contact godaddy and ask them how you register nameservers with them. All you do is go to their site, login, and tell it you want ns1.yourdomain.com and ns2.yourdomain.com to point to those two IP's as nameservers, then you go to yourdomain.com settings and tell it that the nameservers for it to use are ns1.yourdomain.com and ns2.yourdomain.com
You will need to contact your registrar to have the nameservers setup - Some registrars have the option on the control panel of your domain to make new nameservers.
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You shouldn't have to order it. They generally install webmin on new servers there, so just connect to your primary IP on port 10000 and configure and start BIND. You'll then need to tell your registrar about the new nameservers you've setup.