Hi there- from my experience with them, they'll eat anything their own size our smaller without a hard candy shell- they don't show any real interest in beetles or pill bugs. They'll eat crickets, small earthworms, surprisingly large centipedes, spiders, flies, wasps, roaches, caterpillars, pretty much anything...I collected mine where I live, so I just go out and catch whatever appropriately sized bugs I find and throw a few in. They're pretty voracious when they're hungry- I went out of town for a week once and forgot to feed her before I left, when I came back and dumped in 6 small crickets, the next thing I knew she was eating one, had one in one claw and was going for a third.
They live in a very moist forest environment, for substrate I use a mix of reptile sand, local soil (which is pretty sandy as well) and store bought sphagnum moss to help with humidity. Add in a couple hides, rocks, sticks (they seem to like to climb a bit sometimes), some fallen leaves, some wood lice or pill bugs for janitorial purposes, and boom, natural habitat. If you want to use local soil in your mix, go for it as long as it's not heavy clay, just pasteurize it (bring it to 170°F briefly and let it cool normally) first to kill any possible sources of contamination. The substrate should be moist but not so wet that you can wring out more than a drop or two if you squeeze a handful.
I have a mesh top terrarium, when it starts to dry out I just slowly, evenly pour a couple ounces of water in thru the mesh. It rains often enough in their natural environment that I can't imagine it being a problem, and it's been fine doing this for months now. Just keep an eye out for mold, if you get any it's time for fresh substrate, don't let dead bugs sit around, and you'll probably be fine. Room temps are fine, it gets 90 here in the summer and down to right around freezing in the winter.
Oh and everybody loves pics! I'll add one of my setup when I get home.
