It’s been a while since I set it up, but there are some good articles on this website about it.
for my substrate, I used 1part coco fiber, a little over one part long fiber sphagnum moss, a little less than one part fine sand, and one part reptibark. Along with the clean up crew (temperate isopods, dwarf white isopods, and giant canyon isopods) and some clean charcoal mixed with the substrate for the clean up crew