This applies only to Microsoft DNS server as included with Windows NT 4.0. If you want to set up Bind for NT, See that page instead. First you have to have a domain. Next you have to decide if you are going to do Reverse Lookup.
Most people do since it is required to send mail to some domains trying to prevent spam.
So if you're going to do reverse lookup, you must know the name of the zone . The way to do this is to evaluate your IP subnet. I know this is confusing. It can be found in Administrative Tools. If you have never used DNS Manager before you will not have any servers in the left pane.