One of the purposes we envisioned for this site was making recommendations for building a good library of resources. Our reading lists have been the main way we have made suggestions for your acquisitions. Last spring I read a book as a part of a course on the Life and Teachings of Jesus that I highly recommend. The book is Christopher J. H. Wright’s Knowing Jesus Through the Old Testament. My review of this book can be viewed here. Though I have not read them, there are two companion volumes that are I expect are equally good, Knowing the Holy Spirit Through the Old Testament and Knowing God the Father Through the Old Testament. Get all three and dive into the Old Testament.