also on the whole try to avoid like out-and-out written rules because there is a general code of conduct you can expect people to follow and if they don't, but you're on the server, you can just warn them to knock something off
rules work better on like a community scale where you cant possibly police everyone and you have to have finite guidelines for people to follow but the flaw of rules is that forget ups will refer to them as much as a gospel as actual stand up players, but the difference is that they'll start bitching about their innocence when they start harassing people or breaking while technically within their 'legal rights' and that you, the admin, are in the wrong for not making it literally illegal to harass people or break things and that you cannot punish them
however that said you can feasibly just have a rules display and proceed with cowboy administration, as long as you make it perfectly clear for what reasons youre doling out punishment before and after you take action