Not up on wax worm husbandry,but have raised mealworms for over a decade.From the pic it appears you will be rearing mealworms in the three tier configuration,that’s a recommended way to do it.My suggestions would be keep them warm,keep them in the least amount of lighting possible,and do not allow the bedding to become damp.
I use bran as bedding and food,I also halve a potato and place it peel down into the bedding.The potato provides ample moisture for the stages that require it.I also lay opened cardboard egg cartons face down,covering the potato’s and bran,this gives them a hiding place to carry on.
A cleaning schedule needs be followed to prevent an over accumulation of dead beetles,and sheds.The castings will also eventually need to be sifted out and new bran added.Dont get overwhelmed by the process,there is a lot of good info available ,making it so easy a cave man could do it.