For right now, I'm just copying and pasting a message that I had sent to a member of BYC on cultures for a bearded dragon.
Mealworms would be an excellent culture to have around. They're ungodly inexpensive to breed, they breed like crazy, and you can feed the excess to quail and chickens, or sell/trade them to bait/petshops (or even in the local classifieds). For mealworms, start out with a small 50 count pack of them, toss them into a five or ten gallon tank, or one of the 20qt sterilite containers (or whatever you can find that is at least 10" deep. toss an inch of chicken food or wheat bran into the container. To water them, you can use the cricket crystals (buy the dry form online or through a gardening source, NOT the wet ones from the petstore, they put a horrendus price tag on it, plus I think there are preservatives in it them), or you can slice up a potato or carrot. I personally went with the crystals, as it's only $3 to make a gallon of it from crystals. Just let the original breeders reach beetle size, then wait for tons of mealworms to get to size. It does take a bit of time, but it's worth it. Get the large size mealies (not superworms) to cut some of the time off. Some people seperate the pupae into a seperate container until they pupate into beetles, but I never did. If you want, you can refridgerate some to keep them at the size they are. However, there will be so darned many that you won't really need to do this for one single beardie. Just feed excess off to your chooks or quail, being sure to keep some of the largest in the tub for reproduction.
Redworms are another good culture. They're easy to eat, aren't gross, and you can use them to help compost organic waste. I haven't cultured these on any large scale, so you'd have to check into vermiculture if you want to raise them on a large scale. I personally just tossed worms into any container (once I had a ton of them in a baby wipe container). Put topsoil in with them. A lot of places tell you that you need rabbit poop or manure. I never used this and did just fine with topsoil. Not to mention that you could dump them out and add new top soil once their "dirt" turned black. Then you knew that the topsoil was all processed into valuable castings for your plants. Feed them with organic wastes (bunny poop, banana peels, etc), baby cereal (if you have a small amount), cornmeal, whole wheat flour, etc. Just pick out ones that you'd like to use for feeding, fishing etc. Just keep an eye on your total stock to make sure that you're not over-harvesting them.
Waxworms are an alright culture. They just depend on your preference. They are fatty, so feed in moderation to the beardy. Most feeders are supplemental however, and need to be balanced. They require more work than the mealworm, but probably less than the redworms. The work is all concentrated into blocks. You need to have an insect container (I use "culture cups" which are deli cups with holes in the lids covered in polyfabric), for small home purposes, you can use a quart canning jar with fabric in the ring (or use a spaghetti jar, pound holes in the lid with nails, then use fabric in the same way you would with a canning jar). I recommend the canning jar with ring though, which you should be able to find dirt cheap at a thrift store. If you have wheat bran (the cheapest option if bought from a feed store) use this to mix with honey. Mix it only until you have a dry crumble. If no wheat bran, try oatmeal, though I'm not 100% sure how well this would work. If you have glycerine, you can add this as well (I believe it's one part honey to one part glycerine). Put an inch or so into the jar, add your waxworms. Start out with 50 or so of these as well. Once they pupate, add pieces of crumbled wax paper to the jar, where the moths will lay their eggs. The moths need no special care, just remove them once they're dead. The dead (or live) moths can be fed to your critters. Remove the eggs and put them into new containers using the same process as before. Keep 50 or so to reproduce your next batch. You can refridgerate these to keep them at the size you want. Put them on the door of the fridge so that they don't get too cold.
Silkworms are an excellent food source. They are PACKED with nutrition. Unfortunately, you do need a mulberry tree to harvest leaves from, or you must purchase mulberry mash (dried and powdered mulberry leaves). As an added bonus, you can harvest mulberries and make jam from your new tree, lol. You can also use them for silk, but silk production requires that you allow them to pupate, then kill them off. Some people say that the killed pupae can be used for reptile food, but I'm not sure what the nutrient level is at this stage. Anyways, I have yet to get these guys (just waiting on a bit of extra cash to order them), so this info is just from my research and not personal experience. You can order bulk eggs or silkworms. Personal preference there really. I'll probably personally order eggs, then refridgerate extra eggs and only hatch out what I have food for (I have powdered silkworm chow for now, will be ordering a weeping mulberry tree in the spring). Put them in a container (some say a shoebox), add chow paste or YOUNG mulberry leaves. Clean out the frass and old food every day or so (use your best judgement), add new food. Use toilet paper tubes to allow them to pupate in. The moths don't eat, just breed and die, so no special care is needed for the moths.
http://www.beautifuldragons.503xtreme.com/Nutrition.html