Silkworms are really easy to keep, they just cost alot. They are the easiest bug to breed, ever ( After breeding supers mealies roaches and crickets thats saying something) Once they are moths, you will have eggs within hours of them breeding. My best tips are buy alot of food for them, dont clean like crazy like everywhere tells you to( I think this actually lowers their immune system, only clean when you have to) I have a small colony right now ( about 70 that are all about to cocoon!) and 1000 eggs. I got them thinking that if you even looked at them wrong they would die, but they are pretty hardy if kept right. Just keep them warm with alot of food on top of them. Also, get dry food. You can get premade but buying the dry will get you more for less. What I did was buy a little bit of premade and ten pounds of dry, just to see what it looked like and if I messed up my first batch my silks didnt have to wait another two hours to eat the next.

Hope this helps- Matt

Ps. Funny how he mentioned the op wouldnt be allowed breeding roaches and that is all this thread gave them