I raise as many as possible that I have the time and money to care for. The advice to do no more than 2 breeds when starting out is accurate. Learn the SOP for your breed backwards and forwards and be very critical on your choice of breeders. Although, no bird is perfect, you want to start as close as possible. Try to offset any problems in one bird by choosing a mate that is strong where the other is weak. Don't breed anything that has a defect that is severe enough to be a DQ (example: split wing or crossbeak). While color is important, work on correct body structure first. "You have to build the barn before you paint it." Keep detailed records. Mark your chicks so that you know who its parents are. You need to know your best crosses as well as those that aren't producing what you want. Feed your breeders the best you can afford and keep them as healthy as possible so that they'll have good, strong chicks. I'm strictly small time and normally hatch no more than 100 or so. I don't have as large a choice of birds that I'll show and keep as breeders. I usually end up with one that's a stand out. In my breed (modern game Bantam), I can expect 2 good seasons of egg laying from my hens before the numbers laid drop way down. Because of that, I try and hatch every egg I can from my best hens. I have several incubators-one large cabinet one if I have a lot of eggs and some small tabletops if there are only a few or if the cabinet is full. I'm sure there are more things to mention but gotta run and feed everything. I'll post more if I think of anything.