it realy depends on how many you want. at least 10 of each ( lay a few hundred each)
keep your laying bin in the keeper with crickets for a few days (use a clear container so u can see when its packed with eggs) and take it out or the males will try to eat the eggs , keep moist not soggy and they should hatch in a few weeks
personal iv never raised crickets there too smelly and noisy, but my dad useto keep a large plastic bin with a full colony goin in it , in his bathroom for his bearded dragons ( 20-50g? not sure pretty big) and he got away with just leaveing the egg box inside
but i seriously sudguest you dont do this. they will excape in ur house, the room will stink horribly too , and not to mention *cheep cheep*
if your aiming for pinheads id sudgest a fruitfly culture kit, they can last for mounths usaly, or any kind of flys and there stupid easy to keep and pretty prolific ( got one with my first cham 6 mounths ago i still have stuff to make more cultures and a culture goin, id sudguest keepin a few goin and cuting the food to like 1/2 of the directions ... they last too long usaly and just mold after a mounth or so)
and the mealworms.... you whould be better off raiseing silkworms/hornworms/superworms (much better for chams health from what i hear)