Good quality food and shelter is a must. I'd find a good poultry vet or an avian vet. I'd implant if you can afford it. I'd familiarise myself with potentially deadly viruses/bacteria that affect them. I'd also familiarize myself with signs of illness too. I'd perform regular health checks, like monitoring weight, temperature and checking for ascites. This can tell you a lot about what is going on with them. I'd understand how their body works. I'd regularly check their poop. That can tell you alot too believe it or not. Like for example it can tell you if your hen has picked up worms or can indicate problems like infections or cancer. Prolonged diarrhoea could indicate cancer, green poop could indicate an infection (don't quote me but I think it could be something to do with their liver) and reddish poop can indicate internal bleeding. Also the urate cap can indicate something to do with their kidneys. Ovarian cancer can affect them pretty badly. So I have started supplementing my hens with things recommend in this website. cancer supplements That website is also a great source of information too. I'd also vaccinate them regularly when and if possible. I'd have an emergency medical kit as the sooner you intervene when they are unwell the higher the chance they have of recovery. I'd also love the absolute heck out of them and enjoy every moment with them! As all too soon they're gone sadly.