Let him know that he can expect to receive the Holy Spirit after acknowledging his sin, and that he will speak in a language he has never learned before when does. Afterwards, arrange for him to be baptized in water. See Lesson 13 for scriptures on water baptism and receiving the Holy Spirit. Once a person has surrended his life to the Lord Jesus, he needs to understand that he has not only become a part of the 'Head in the heavens', but also a part of the 'Body of Christ on earth'. Helping him to understand that the full gospel is both vertical and horizontal is essential to developing spiritual maturity.
Man is spirit, soul, and body.
In our spirit, God has already perfected those of us who are in Christ. These are all already true of us in the unseen and eternal realm, in God's kingdom, in our spirit. In our soul, however, in the seen and temporal realm, we are in the process of being sanctified. We have needs. Our emotions fluctuate.