Where are you? It helps to know your climate on this type of question and many others. If you modify your profile to show a general location this information is always available. Welcome to the forum, by the way. Glad you joined.
How many adult chickens do you have, how many chicks are you getting, and how big (in feet or meters) are your current coop and run? Do you free range? Do you have electricity to the main coop? Do you have an outbuilding (or garage) with electricity?
There are so many different ways you can go with this depending on what you have to work with. A small elevated backyard coop in suburbia can be totally different from a large walk-in goop in a rural area. If you can let us know what you have to work with we may be better able to make helpful suggestions.