How to earn from google adsense in five easy steps:
1. The easiest website to put up is a blog. Open a blog at Blogger.com. Your blog will have the address "somename.blogspot.com". This is free.
2. Blogger/Blogspot is owned by Google. In your admin panel, you will see a link asking you if you want to put Adsense in your blog.
3. Make some initial blog posts. Make sure you enable "ping" so that your blog posts are picked up by Technorati et. al. Submit your blog to blog directories.
4. Submit your application to Google Adsense program. Make sure your website complies with Terms and Conditions. Adult content is not allowed alongside Google Ads. Do not submit your application until you have posted some content.
5. Promote your blog, but do not ask people/friends/family to click on your ads, and as Fei Long said, DO NOT CLICK ON YOUR OWN ADS because Adsense can kick you out for click fraud.