Web application development

I have an existing website and I need to have companies advert on my site. I need something similar to google. By this I mean the companies will advert on my site but not on the homepage.When somenone has logged into the site its only when the advertisements will be seen on the right hand side of the main webpage but not on the homepage.There MUST be an option for me to know the click through rates on these adverts. I intend to start the adverts free but will charge for them in due course.Thus I need to know how many clicks were imprinted on each advert per month if possible. Since this is a straight forward job, I expect final quotations in doing this whole job.Only bids with final quotations ( not hourly rate) will be entertained. Final quote may vary slightly(pending) and this is acceptable.