I'll dig up the link and update this post with an edit when I have it.

Edit: [url=https://www.roleplaygateway.com/original-1990-tutorial-from-eden-era-t99090.html]Here you go.[/url]

Edit 2: I understand this isn't exactly a comprehensive 'rule set', but is a structured tutorial set in the Eden structure. If you need something more specific I can find another link.