# to reveal his Son in me

Possible meanings are 1) "to allow me to know his Son" or 2) "to show the world through me that Jesus is God's Son."

# Son

This is an important title for Jesus, the Son of God.

# preach him

"proclaim that he is God's Son" or "preach the good news about him"

# I did not immediately consult with flesh and blood

 "I did not immediately ask people to help me understand the message"