Once the domain registration is done,  you need a host to host your pages. Google sites offer that wonderful host with some tools to build a website. It is all FREE. All you need is to go to their http://sites.google.com/.  Follow the steps below.

1. Register an account. If you already have a gmail account with google, then just use that to access google sites.
2. Click on the button "Create New Site"
3. Follow the step by step instructions