Breeders takes time in building up a good game fowl. Not only this but they need knowledge and wisdom during the raising up process. Everyday they dedicate their time in taking care of the game fowls.
There is a catch. He have to choose the best breed he could raise. Roundhead, Sweater, Hatch, etc. There are a lot of choices. But he have to carefully study them as they have different performance on the cockpit regardless of their training.
Expert breeders are the best to be asked on breeding as this topic is conflicting. It can be mind wrecking. One piece of advice is to experiment with what knowledge and wisdom you have in breeding.