What you have do to Register with Google Adsense
1. You have to be a 18+ old person.
2. You have to have a web site or blogs. You website has a top level domain. (eg for top level domain - yahoo.com. google.com) Sub domain not allowed.
3. You site must have enough unique contents. If your site has copied contents, your application will be rejected.
4. Web site must be at lest 6 month old for some countries Including India and China.
5. Porn web site not accepted by Google.
6. you have to read and understand all condition of Google Adsense and you have to ensure that your site comply with Google Adsense terms and condition.
If all above steps are complete, you can apply for Google Adsense Without any problem. Good Luck. If you have a problem you can post it here.