Adsence Policies   

Short desciption of the most important points

1. Google Alows you to put up to 2 Adsence Adds on one page  . 

2.You can put the as many products as you want 

3.Never write something like "Please click on the Adds below" - This is against Google's policies . 

4.Don't make a spam site which only intends to make money gaining user clicks  .Your site should be an informative site  - the results of the clicks would be much better in such a site since people will spend more quality time navigating your site .