google is good one on that subject , but the problem is the competition is so hard , you will be competing dipending on what you will advertise, with big names on that product , they pay high prices for a click , so they will be in the first pages , so it dipend on how much you want to pay google for 1 click(visitor) to your website , exemple , if you sale a product or a service for 4$ , you need to pay more then what your product cost that way you will be one of the first firms who show's up in the first pages , or you pay $0.05 and you will be way back in the corner so far that people can not even rich the page where your add will be ... adwords for google is made for some one who realy wants to invest good money extra just for advertising....
but i wish good luck to you buddy :wink: