Quote from Google Adsense

Google AdSense is a free program that enables website publishers of all sizes to display relevant Google ads and earn. Google Adsense is Google Advertising Program, display ads on your website’s content pages and earn from valid clicks or impressions.

Before signing up in this program, better knowing term and conditions.

Content
Your site must contain enough content. At least 10 articles before submit. Not enough content will be disapproval reason.

Supported Language
Google adsense not available for all language. Suggested to post in major language (English). Here the list supported language for Google Adsense
Arabic Hungarian
Bulgarian Italian
Chinese Japanese
Turkish Korean
Croatian Norwegian
Czech Polish
Danish Portuguese
Dutch Romanian
English Russian
Finnish Serbian
French Slovak
German Spanish
Greek Swedish
Hebrew Thai

Indonesian and Vietnamese, only supported for Adsense for Search

Payment
Google Adsense combining per click and page impression earning. Payment will be sent via check and western union.

Register
Register to an official Adsense site