web advertising

Hello,

I'm a web developer and I developed many websites in my life :), so I
know all technical aspects, but I don't know much about online
marketing. I would like to do some web advertising. I understand that
the common approach for charging for add space is either click through
or impressions. I will need to be able to monitor these and log them
to ensure appropriate charges. I would also need to be able to add/
remove add and modify their configuration i.e. size/impression ratio/
etc.

What sort of products or services I can use in this instance. I use
PHP/MySql to develop my sites.

Thanks a lot,
Richard