There are a few different ways you can do it. Basically you just need a container/containers, something to feed them (dry and wet) and some worms to start out.
CONTAINER
I use a little Rubbermaid type of small tote. Its small! I need to start another one and separate the worms from the beetles. They need to breath, but the adults can't fly. Really any old container will work. They don't care if its pretty. Mine is drawer style, so we just pull it out and take it to the chickens and pick out what we want.
FEED
I use oatmeal and chick crumbles as the dry feed/bedding. Some people use wheat germ. But since I am allergic to wheat it is not a good idea for me. Cheap store brand oats are good enough. As far as the wet food. They get their hydration from that. The suggestions I have seen most often on Youtube videos are potato or apple slices. But here in our humid climate they mold WAY too fast. So I use carrots or slices of sweet potato. I like baby carrots the best. They keep well and the worms eat them until they are almost completely gone without having an issue with mold.
WORMS
I bought a TINY little container from Petsmart to start out. It only had somewhere around 25 -50 worms in it.
All you do is pour a good deep layer of bedding about 2 inches deep if possible and add your worms. Then set a couple of pieces of their veggie on the surface. Adding a small piece of something for them to hide under is appreciated by the beetles. After awhile you will see an alien looking white-ish pupae. Then after that they turn into the small Darkling Beetle. Treatment of the adults is the same as the worms. Some people separate the different phases of the life cycle to avoid newly hatched adults from being damaged by the others. There are a ton of YT videos about it too. I need to set up a couple of more bins because we just had a BUNCH of adults hatch.
Time it takes in a week to tend to them??? Maybe about 5 minutes.
Do they smell. A little. But adding more bedding will dry it out a bit and then its not bad. Eventually though you can make a new bin and transfer what you want. But then there might be a LOT of baby worms left in the soiled one. So you just want to leave that out of the way and check back later. Eventually they will either quit hatching out and growing, or you could just sprinkle that out in the chicken yard for them to be completely devoured by your chickens.
Watch YT videos to see if I missed any tips.
Thanks so much I'm going to give it a try they are too expensive to keep buying them. Pam