Each advertiser will review your request and approve or decline your application. Cut the code and paste it into your web page. Check your daily statistics and see views, clicks and sales. For example, there are several search engines and directory services available for businesses, jobs or email. Consider recommending some that are excellent and pay a small search fee.
Libraries are in a great position to fundraise on the Internet.
Many library sites have a dedicated following and offer a rich resource for the community. They are recognized as a trusted place that will provide a clearinghouse of relevant information. This is a real plus when you start to look at generating revenue from your web site. This trust should not be taken lightly. You also need to make sure that you're still selecting quality resources or services that benefit your community.