KidsCom - A site for kids looking for keypals. Maybe you could visit some other schools and take a look at what they are doing on the Net. Catholic Schools on the Net - Worldwide listing of schools. You must take steps to supervise your student's use of the net, and support efforts to provide a rating system for the net. Protect the rights of all Americans to free speech.
Several programs are available to screen out objectionable sites, but adult supervision is best.
This site also has links to kid safe sites. By the Texas Internet Service Providers Association. Cyber Patrol - Filtering software by the Learning Company for Windows and Mac. Filtering is based on lists of acceptable and not acceptable sites. Cyber Patrol can also limit the time spent on the net.