I've posted this video before:
But just yesterday I came across this excellent resource from the ESV Study Bible: Vern Poythress highlighting the History of Salvation in the Old Testament.
Bookmark this resource and refer to it as you read through the Old Testament. It looks like a great way of seeing the point that Jesus made to His disciples after the resurrection:
"And beginning with Moses and all the Prophets, he interpreted to them in all the Scriptures the things concerning himself. " Luke 24:27