It's not entirely clear what you're asking. Are you asking what data you have to provide to your domain registrar? Or are you asking for some configuration data for your machine?
Are you planning/hoping to use your Mac OS X Server as the authoritative DNS server for your domain? (this is usually a bad idea unless you really know what you're doing).
If you're setting up the remote domain on your registrar's servers then there's nothing you need to do for your machine. For simplicity's sake you don't need to do any DNS for your domain on your own server - let the service provider do that. If you want to setup your domain internally as well, then I'd recommend disconnecting your public records (hosted by your service provider) from your private ones (running on your own machine) since you will likely want to hide your internal network addresses from the public.