This will allow the chicks to run in and out of the box. Use 2 lights, in case 1 goes out, you will end up with cold chicks instead of dead ones. Heavy duty light bulbs are used for heat. The nice thing about the cardboard box is that it can be burnt when the chicks are weaned. With a commercial brooder, it must be disinfected with the bleach solution mentioned above, after use.
Most feed stores offer chick starter, either medicated or non medicated.
This can be feed for 4-6 weeks after which the chicks are change over to a grower. Feed grower until the chicks are about 4 months old at which time they can be put on a layer type of food. When the birds are placed on layer, it is time to select your breeders for next year. Review your Standard. Then check each bird for conformation.