DNS server

hi
i have one win2k3 serever (IBM)and 20 no. winxp system,i was configured win2k3 serevr with active directory,but how will i configure this serever as DNS server please hepl me for that.

server name:serever1@abmpl.com (192.168.1.2)

and i was created two users under new OU,how to give them only 2 sites access