You are asking all the questions I spent nearly a year asking and finding out information about while in the process of designing and building our coop! It sounds like you have a good sized yard big enough to contain a decent amount of chickens. Because of your handicaped condition I reccomend you do as much reading and research as possible to look at everything available to ease your daily maintenance. You can find everything from soup to nuts on this website just by asking and exploring and it seems you have multiple responses already! To tough on a few things you mentioned and primarily chicken breeds for both eggs and meat. I myself purchased from Tractors supply in the spring of last year. They in turn order from a breeding house in Zeeland Michigan which is one of the largest breeders in the state of Michigan. Reading up on breed selection for not only egg laying ability but also for temperment and climate is important when picking your breeds. All hens lay eggs but are not all the prettiest and best suited for egg and meat. I have 5 breeds of chickens. 5 of each breed. The best egg layers of the bunch are my Black sex links and Plymouth barred rocks. I have Jersey giants, Orpingtons and silver laced Wyandottes also. The wyandottes and giants will go to market and eventually the barred rocks will follow. It takes about 6 to 7 months from birth to the dinner table or freezer, sometimes longer for some breeds to gain their full weight. Next spring I will most likely purchase some Bhramas and Delawares for a bit of variety. Golden laced Wyandottes make for tasty tableware birds and are also good egg layers. Keep in mind that your meat birds will lay eggs until market time. Takes about 5 months before birds start laying eggs from hatch. Good luck with everything and have fun!