fog,
My FIL had one and my Grandpa always had them when I was a kid.
Papaw had an elevated plywood box with plywood top. You can feed them newspaper and corn meal. My FIL had a plastic tub with a plywood lid sitting on blocks inside a larger tub full of water. The water was to keep ants away from the worms, but Papaw never had ant problems with his elevated bed either.
Best thing to put them in is cow manure mixed with rich top soil. You want a dense moisture rich soil bed. Can't have too much cow manure
Don't know if those are the best, but they worked.
Have a Good One,
loder