You know your relationship best. I would suggest talking about it though. The more openly the two of you talk, the better. Stuff that you hide can turn out badly. It's interesting that you used the word "compartmentalized", that's how I managed to turn an open and consensual poly situation into a hurtful affair. You go from compartmentalizing to not sharing details to overt lies. Sometimes "comfortable" now can lead to bigger problems later.
My wife likes to suggest https://www.amazon.com/Smart-Girls-Guide-Polyamory-Relationships-ebook/dp/B01LXZ6F7T/Looking at the "customers who bought this also bought" on amazon provides some other good suggestions. Non-monogamy has been around a long time, but the discussion about it has gotten more open and some of the thinking and terminology has changed and evolved over time. The ethical slut is a book that gets suggested a lot, because it has helped guide a lot of people over time, but people also disagree with parts of it now, or maybe just with how it explains some stuff. I'm not saying don't read it, I'm just saying not to take it as the one true way gospel truth.
Best of luck. Take it slow and talk a lot.
I totally agree with you that a Google search doesn't seem to bring up a good initial list of resources.
I really like the podcast Poly Weekly, which no longer comes out weekly, but answers listener letters and talks about polyamory in pop culture. For someone just starting, you could search for episodes about opening up or new to polyamory and surely you'll find some interesting episodes.
I also like the Multiamory podcast. I'd try the same thing, searching for episodes for people who are new to polyamory to start. One of the women on this show wrote a book that's pretty good (despite the title): The Smart Girl's Guide to Polyamory.
People seem to really like Polysecure, though that book didn't do much for me at this point in my life personally. I found Opening Up helpful years ago when I was first getting an introduction to polyamory and nonmonogamy while in a formerly monogamous relationship.
I hope at least one of these recommendations is helpful to you!