W2K Web server configuration

I already have the IIS running as the intranet webserver.Now I’m planning to act it as public hosted server.The private IP address of the webserver is already mapped to a global fixed IP address.All the outside users were able to view the contents of my website hosted on the webserver but only thru the fixed IP address.Is there any good website can help me to configure the DNS server or any good advise on simple configuration.I already have an internal DNS server.