Breeding crickets isn't worth the trouble unless you do it large scale, like companies such as Ghann's or Armstrong Cricket Farms. They have literally millions of crickets at any given time.
Honestly though, try the search button before you post topics, I know this one has been addressed. Here you go though...
Cricket breeding is easy for those who keep constant watch over their hatching lil ones. Keep in mind pinhead (baby) crickets are notorious climbers, and die easily if not tended to with food and proper water setup (meaning a cardboard "ladder" leading up to the dish). But a single female can lay hundreds of eggs. So you'll have plenty to practice with.
First step, take natural peat moss, basically pure dirt (not true dirt but looks like it, cleaner than "dirt"), soilless), put it in a 8"x4"x2" container, level off, place cardboard ladders allowing pregnant females (females have the "stinger" on the end allowing them to inject eggs into the soil). Keep the peat moss moist, even while hatching, until finally you'll start noticing lil tiny things smaller than sugar ants, those are your babies, make sure they have plenty of water, and I also like to feed these lil guys a lil bit of everything, finely powdered gutload and fresh veggies, and let the lil guys grow, keep feeding till they grow to the desired size.
Repti-worms are Black Soldier Fly Larvae, and can occur naturally in composting in many states, otherwise keep Reptiworms healthy until they finally pupate and hatch into Black Soldier Flies, keep in a screened enclosure to allow mating in midair, and I like to use moist composting ingredients in the "Breeding Pan", similar to crickets. They will lay eggs, and hatch within a week +- into the larva we know as "Repti-worms", "Calci-worms", or "Phoenix Worms".
I hope this helps.
Dave
SmallPetFeeders.com