Here you can learn how to create an account in google adsense.
Go to the google.com/adsense/. click on sign up button.
One form will be opened. Rremember your website url should be www.aaaaa.com Not www.aaaa/aaa.com. Enter payee name, the payee name should be the same of domain owner name. Google will send the cheque to this payee name and address so you should conscious about it.
Now login to google adsense account Click on adsense setup to create advertise. There is many option to create an advertise.