A reprint of the original Service Manual (The Model T Bible), Bruce McCaulley's big Model T book & Service Bulletin Essentials for starters !
I would suggest the new large print edition of the service manual. It has much clearer pictures. When an arrow points to a bolt you can actually see which bolt they mean. I first bought the small one and then the large when I found out about it.. well worth it.
https://www.themotorbookstore.com/1909-1927-ford-model-t-service-manual.html
John