Seting up a DNS Server

My company has a web site hosted with one of the ISPs. we also have few URLs. We want to set up a DNS server by creating myltiple zones that will point to one IP address for the company’s web site. I have been searching for a while and reading diffrent publications but I can not find an answer on how to do it. I have to mention that we use NT, that will make it harder to find good meterial.