Hey Mia 
Thanks for reaching out!
I’m seeing two separate, but related, parts of this request:
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How do I share my community’s chat guidelines with users, especially before they start using chat?
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How do I monitor / enforce those guidelines?
It sounds like you’d like to focus on the first point to begin — to start, can you tell me a little bit about where your guidelines live today? I’m assuming they live in a topic somewhere but please let me know if I’ve got that wrong.