Hi, welcome to the forum from Louisiana, glad you joined.
I don't know how much experience you have with breeding any animals or what your knowledge of genetics is. I assume you are more interested in how to manipulate genetics than in how to hatch eggs and raise chicks? I could be wrong.
My main suggestion is to know what specific traits you are breeding for. That's not always as easy as it sounds and may take some experience to figure out. I know my goals changed as I went along. For egg laying, how much does egg size matter, number of eggs per week, or even egg shell color?
Meat can be more challenging. Why did you decide on Bresse? What traits of Bresse attracted you that you want to duplicate? Then those are the traits you want to concentrate on.
One of the traits that some of us that breed for meat tend to concentrate on is size. For some people size is extremely important. It is not for me, there are only two of us and I can get two meals out of a small pullet. Some people only eat the boys, some of us eat both girls and boys. The age that you butcher has a big effect on how you can cook it. Some chickens of the same breed can grow at different rates, so do you want a chicken that reaches a good size at a certain age? How do you feed them, do you provide everything they eat or do they forage for a lot of their food? That can affect the cost of feed or the feed to meat conversion rate.
Each of us raise them differently in different climates so what is best for me is probably not going to be best for you. I'm a proponent of trying different things and see how they work out at your location with your methods and for your goals. We often find that what we originally thought we wanted really isn't what we really want.
Probably not where you expected this to go but I'm not sure what questions to respond to. Anyway, once again
