If you want to create your own website, it is useful to know something about HTML (hyper text markup language). This is the language websites are written in. Depending on your interests and skills you can create a site entirely in HTML, or use a WYSIWYG (what you see is what you get) editor which shows you what the page will look like, rather than the code which is behind it. This sort of programme makes it easier for novice to create their own site.
Look at free editor NVU, or buy a programme like Dreamweaver. When you have made your site, don’t forget to check that it looks good in browsers like Firefox and Safari, as well as Internet Explorer.