As for books. 'The Chicken Health Handbook', by Gail Damerow is a must for any chicken keepers bookshelf.
IMHO, 'City Chicks', by Patricia Foreman for small urban/suburban flocks, 'The Small-Scale Poultry Flock', by Harvey Ussery for a bit larger flocks and 'Talking Chicken: Practical Advice...
No offense but there's no such thing as an average hen. A caged Serama will eat about a fifth or less of what a LF JG will eat in a larger run.
A LF egg breed at 20 weeks will eat about 0.14 lbs a day. A LF meat breed at the same age will eat 0.41 lbs.