Scat play is a common BDSM fetish. I can't offer any feedback to this fetish as I do not understand this fetish or how it appeals myself, but I can point you to the right direction.

Fetlife is a social media website for people into BDSM and all other fetishes. You will need to create an account which is free, and they have a lot of forums for all different subjects and topics, and they have a novice and beginners section as well.

If you do not want to participate in scat play, don't. I wouldn't say it's for beginners, but I have no idea how to participate in it and what you have to do to get the scat to be the right consistency, because I believe it has to be liquid-y as far as I could tell in pictures I've seen. And if scat is involved he'll also likely be interested in being urinated on. If you love him, but don't want to do scat play, then don't do the scat play.