If you want to put your Web page on your own domain, then you need to buy a domain name from a domain registrar. My favorite is Network Solutions.
The following steps will take you through how to buy a domain name with Network Solutions. It's easy to do, and you'll have your own domain before you realize it.
There are many places you can go to register for a new domain name. My preference is Network Solutions because I've been using them for over ten years. They may not be the cheapest, but I like their service and it's very easy to work with them.