DNS Configuration pls….

Hi, i installed windows2003 server and installed AD, when i installed AD it asking auto config the DNS? i press ok.
now installed DHCP its working fine.
BUT DNS configuration not getting how to do that when i create forward lookupzone its givig message already configured. what to do iam not getting any thing. how to cinfig and how to get instenet in my client system…

please help me any one…….