You can charge per year for a basic five page monthly newsletter, although it depends how specialised your information is.
You could also produce CDs and disks featuring examples of Web sites, along with links, plus Internet software and more.
Don't forget to ask permission before using anyone's Web site as an example, although you can charge for the privilege, since the organisation will probably view it as a good source of advertising.
Putting ads in magazines and setting up your own Web site will be the most effective way of marketing this service.