Enclosure: There are many different options, but the most common are tanks and plastic tote bins. Enclosure size will depend on the number of crickets and their size. Generally, you want at least a 10-20 gallon (40-75L) tank or a 50qt (64L) bin. Regardless of the type of enclosure, it must have plenty of ventilation, either an all-mesh lid for a tank or many ventilation holes along the sides and lid for a bin.
Enclosure setup (décor, substrate, etc.): Set up the enclosure with egg flats for climbing and hiding. Substrate is optional, but it can be helpful to keep the crickets cleaner as well as reduce smell. Vermiculite especially can help to reduce odor and keep humidity down. Crickets can also be kept on a naturalistic substrate.
Diet: Diet should be primarily fresh foods like vegetables and some fruit, as well as protein (fish food, safe cat/dog food, cricket/roach chow, etc.). Any fresh foods should be removed within 24 hours if not eaten to avoid bacteria growth and smell. Hydration like water crystals can also be used.
Breeding/egg laying: If breeding, temperatures of 85-89°F (30-32°C) should be maintained, ideally with an overhead heat lamp like a halogen or deep heat projector. Once mature, the crickets should also be provided with a container with a moist substrate to allow for egg laying, such as a short sandwich container or a deli cup. Damp vermiculite or a soil substrate (coco fiber, peat moss, etc.) can be used. Some will suggest using a mesh/screen over the damp substrate, with large enough holes to allow for the females to oviposit in, to prevent eggs from being eaten. Place a small piece of egg flat on this container, as well as a smaller piece as a ramp into the container. Only leave this container in for a few days before removing and replacing
Incubation and nymph care: Place the lid on the egg laying container (with minimal ventilation holes) and incubate at 89°F(32°C) for 8-10 days or so. At this point the pinheads will begin hatching. Once this happens, place the egg container into another container and put a small piece of egg flat into it to make a ramp for them to get out. Keep these nymphs the same way older crickets are kept, with slightly higher humidity for the first few instars.