I posted my most recent map on Reddit and to my surprise, somebody PMed me asking if I'd be willing to do a commission to make a map.

This, of course, surprised me. I've never seen cartography as more than a fun little hobby but the idea of doing it for some payment is really interesting. However, I've never done anything for commission, and have both no idea what I should charge, and where I can seek clients otherwise.

Any advice?