When you register for a Google Adsense account,
they require you supply them with a link to your website.
The easiest way to do this that fits their criteria is to
create a free blog at http://www.blogger.com/ .
Create a free blog, generally you can use your name as the blog address.
Then add 5 -10 Interesting Posts to this blog.
Once this done you can then use this blog as your website
when creating your Google Adsense Account.