It's EASY. I have mine in shallow plastic drawers. Give them a couple inches of oats/cherrios/puffed rice/wheat etc etc. I give them the same food mix that my mice and rats get.

Put a moistened paper towel in for them to drink from. Don't put this on top of the food because it will mold. Re-wetten the towel every other day. You can also use fresh fruits/veggies, but I'm too lazy for that.

Add mealworms. The more the better. From hatching to pupae stage is 3 months. Pet store bought mealies should take a week or two to pupate. Remove pupae daily to a separate small container for the two weeks it takes for them to metamorphose into beetles. The beetles can be put back with the mealies. Just wait awhile and eventually you'll see tiny baby mealworms.

That's it.