Here is the link for the signup page: https://www.google.com/adsense/g-app-single-1

Here is how the signup form looks like

The important information that you give to Google is as below:

• Your website URS. You must have a website. If you have multiple sites just provide the URS of your biggest site. With one account you can apply the AdSense code to multiple sites.
• Language of your website
• Account type, whether individual or a company. Whether you are a company with more than twenty employee or one person only.
• Your contact information.
• You will be able to choose between three different ways of receiving your money: Electronic Funds Transfer, Local Currency check or Secured Express Delivery. It is better to get your money by direct deposit or if you want you can choose any of the other mode of payment.
• Whether you want content based ads or search ads or both. I recommend you to choose both.
• Once you get approved, you get a piece of code that you have copy and paste into your webpages.