If I followed the how to guide and install ISPC, does that mean that I can point a domain name to my server using the nameserver fields, so I would have a domain name registered using www.123-reg.co.uk and then put in my own server ip addresses (or ns name) into the name server fields and then my server would take care of the rest. If you know what I mean. Thanks
Yes thats correct, if your server shall act as nameserver. Make sure you added a primary record for your domain in the ISPConfig DNS-Manager.