I'm rather new here, but I don't really get the desire for an official set of rules. Why set up a tangible list of things you need to do when it seems to me like the whole point of a forum is to have a place for thoughts to be posted? If someone posts dumb [expletive], tell them so. Likewise, if someone posts amazing content, tell them so. The internet is an interesting place because there's all the most useful information in the world at your fingertips, as well as the most useless crap:
To me, this forum is a place where people that share an interest in the Chicago Cubs can post their thoughts on the cubs, or on whatever else they want. I just don't see a need for some set of rules to dictate how and what one should post.