After the resurrection, Jesus came again to His disciples:
Luke 24:25 And He said to them, "O foolish men and slow of heart to believe in all that the prophets have spoken!
Luke 24:26 "Was it not necessary for the Christ to suffer these things and to enter into His glory?"
Luke 24:27 And beginning with Moses and with all the prophets, He explained to them the things concerning Himself in all the Scriptures.
and then later on, the disciples were assembled in a room and the Lord appeared to them, and:
Luke 24:44 Now He said to them, "These are My words which I spoke to you while I was still with you, that all things which are written about Me in the Law of Moses and the Prophets and the Psalms must be fulfilled."
Luke 24:45 Then He opened their minds to understand the Scriptures,
Jesus showed them Himself, in all of the Old Testament. As you grow in the Spirit, and God grants you more and more revelation of His Son, you will see Christ in EVERYTHING, and I do mean everything.
I cannot go through the whole Old Testament with you here, but let me give you just a few examples, to illustrate:
1) Abraham offering up his son Isaac - clearly an example of the Christ Jesus
2) The manna which came down from heaven in the desert - Jesus the bread of life come down for men to eat.
3) The tabernacle with its intricate design and pattern to be perfect according to what God showed Moses - Christ, perfect in every detail in and by God the Father.
4) < You may find it difficult to see Jesus in the book of Proverbs, but... even there. For it says in Corinthians....>
1 Corinthians 1:24 ...Christ the power of God and the wisdom of God.
and so, wherever you see the word "wisdom" in the book of Proverbs, substitute "Christ".
5) Jonah in the whale's belly for 3 days - Christ descended into the depths for 3 days.
and so on, and so on.
So, Jesus has already told us that He is the fulfillment of the Law, and we have it reckoned to us, by Him, if we learn to trust Him and believe. This is God's doing, and it is marvelous in our eyes!
When you read the Old Testament, look to see Jesus in all things. This is the command and desire of God, that we believe in His Son, exclusively.
Hope this helps!