To develop a website,

1. You need to regsiter a domain name.
2. You will have to get a web host.
3. Use HTML to create the front end. Plus CSS and maybe JavaScript. If you need dynamic content like accessing a database etc then you have to learn server side languages like PHP, ASP.NET or JSP.

thanks for the information. but i need to know where i can register the domain name. it will be helpful to me, if you give this information also.
thanks so much again for the information

You will find useful information on how to register domain name and where plus how to get start on below link:
http://www.getawebsite.friezedesign.co.uk/index.htm

try godadd, $1.99/year for new domains

any free domain name registration sites

You can check website like www.dot.tk ,etc.