There are many resources that discuss responsible internet use and guidelines for parents whose children are learning to navigate the web. Here are some links that might help.
Common Sense Media – Six tips for parents to become media savy.
Cybersmart – Curriculum resources for introducing responsible internet use.
Be Web Aware – Information and tips for parents on how to help young people enjoy the benefits and manage the risks of being on the internet.
Wired Safety – Free resources on internet safety
Internet Access Tips – A list of guidelines for parents from an educational consulting company.
Resources in Japanese – This site covers topics such as what parents have to be cautious about when kids are using computer and how to set rules for children using internet.