i have two years experience of keeping the nasty little things on the college course I was doing.
make sure the box you keep them in escape proof - you dont want the little darlings escaping all over your house. and breedingand generally multiplying into their hundreds. put a wet paper towel or similar in there so they can suck the moisture off - crickets are very bad swimmers. we used to feed them chicken food ground up, but I suppose any pellets or something would do anything high in calcium- they need extra calcium if you are keeping them to feed reptiles as they dont generally have enough. in the UK we used to use something called "Cricket Diet Plus" you sprinkle it on the crickets just before you feed them to the critters and then they get their calcium that way. good luck, any more questions just ask!!!
p.s crickets do smell but if you put newspaper in and change it when it starts to smell or when you get new crickets it should help to negate that. also, do put the egg box in but you can put their food in that. remember, the food has to be ground up small enough so the crickets can get it in their nasty little mouths. sorry, crickets leave me cold, personally! but the reptiles were lovely. especially the bearded dragons. and leaopard geckos