Breeding crickets is really easy, but need constant attention to clean out dead crickets all the other mess they make. An unattended colony will die very quickly, I once opened a tub with over 50 crickets all dead due to a powerful smell of ammonia from all their mess and rotting dead crickets. Ants also pose a great threat if they get in to your breeding colony.
Oxyhaloa Deusta roaches are great to breed when you have smaller T's and slings, because they breed really fast, and their young are born live at a very small size, about 3mm, which is about the size of a decent pin head, but has more flesh. The best part is that they climb ALL over the place, and inevitably find your T and get munched, especially great if you have arboreal slings, because these roaches climb glass easily.
Once the T's are bigger, Blaptica Dubia and Blatta Lateralis, and Blaberus Fusca roaches make very meaty meals.
HS