On the master server, make a zone file for the domain and a named.conf file that calls it. I haven't done it recently but there are sure to be some sample files either with the software, or with your distro. If not you could start reading at
http://www.isc.org/products/BIND/
On the NT server, you open the DNS manager, add the zone, choose "secondary", and tell it the IP of the master.