Windows 2000 server - DC installation

Hi chennaithomas, welcome to A2K!

Unfortunately, I don't believe you'll be able to get a simple answer to that. W2K server as a domain controller has a lot to configure. You need to start reading & learning like others here who can help you have done. You'll need to promote the machine to a DC, configure the IP address, install and configure DNS, possibly configure Forwarders in DNS to allow Internet access, configure the client machines with proper DNS settings, configure sites and subnets in Active Directory etc, etc. In other words, it's a bit complicated to explain here. If you have a specific question I can try to help with that (I'm NOT a server guy though). It's not brain surgery, but it's not a 5 minute project either.

Here are some good resources you should look into:
Windows 2000 Step-by-Step Guides -- From microsoft.com. Lots of good walkthroughs for server setup & configuration there.
Installing a Windows 2000 Server as a Domain Controller -- PDF file from pclan.calpoly.edu