There are numerous companies that offer pay per click advertising programs, and each of their terms and conditions are slightly different. For example, some of them allow you to write just about anything you want in your actual ads, while others are very strict about ad content. In addition, some pay per click advertising programs are much more successful than others. Before signing up with any of them, you should do some research to see which programs have the best reputations for helping website operators turn clicks into sales.
I would just like to add, I have 2 years of experience with pay per click campaigns, have my full adwords accredited status and manage a number of clients UK and internationally. If you need any help drop us an email.
Wishing you all the success in the world,