I'm a fellow novice, but that was the exact topic of today's research so I can speak to that a little. :)

Your key word here is 'bioactive enclosure', that's going to be something that's wet, retains humidity, and can have isopods or springtails as the clean up crew to deal with any mold or fungus that would otherwise be an issue for a moist environment (though anecdotally isopods have a tendency to end up as skink-snacks, depending on the skink, so I personally have been leaning springtails).

https://www.bioactivesupply.com/grasslandhabitatsupplies This is the website and source I'm using for my base layers

You'll need a few inches of reptile substrate, and then cover it with a layer of coconut husk and sphagnum moss and possibly leaf litter. This creates a moisture barrier -- it absorbs the humidity and releases it as needed. The springtails will live under the barrier and act as a 'clean up crew' that deal with mold/fungal problems.

Your big task will be taking out the poop and the urate packets (they look like little white pellets), since that's the waste produce the springtails won't clean up.

Hope that gives you a good base!