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This is the how-to I wish I had when I set up my Prosody XMPP server. I have no idea why in tarnation no search engine would show it to me.
https://homebrewserver.club/configuring-a-modern-xmpp-server.html
@strypey @thraeryn if you're looking for rooms, xmpp:lobby@rooms.chinwag.im come hang. It's chill. 
@thraeryn it's very good and clear, I keep forgetting to link to it from some of my resource pages. I'll try to get that done tonight and see if we can get it a bit more visible.