In the past I have have several different breeds. I've done some experimental breeding. My passion has been heritage lines. My advice is to get what you want. If you are happy with your chosen breed stick with it and breed your remaining birds and keep the best as future breeders. I do that now. I hatch out all of my chicks from my chosen breeds. I hatch out around 50/50 male/female. I keep the best for breeding and sell mostly the extra males but always keep one and a spare in case one should die for any reason. I pick out my best birds for breeding for the traits in the birds I'm looking for. Selling the extra males helps to offset the cost of the feed. I also sell eggs for hatching and eggs for eating. For the most part my birds do take care of themselves. I have processed some but the cost isn't cost effective for me so if I want chicken I go to a butcher down the road. I can make more money by selling the live birds and buying an already processed bird.