(Acts 17:30)
Repent means to turn and go the other direction. It means to leave your sin and old way of life behind and start seeking God (1 John 1:9).
Repentance is not a work we must do in order to be saved, it is the response God works in us when we get saved, which will result in works.

(Romans 6:3-4)
Baptism is an outward expression of an inward reality. It demonstrates that the baptized person has been united to Jesus in his death, burial, and resurrection, as they go under the water and come out again (Colossians 2:11-12). It also symbolizes a person's sins being washed away (Acts 22:16). It is the chance to publicly identify with Christ and the new life he has given you, and it is something Jesus commanded us to do (Matthew 28:19-20).

(John 14:15-17)
God gives a special gift to all his children—himself. He actually comes to live inside of us forever.
Without the gift of the Holy Spirit, we would have no power to live out our new life (John 14:26).
But by the Holy Spirit we are free from the power of sin to live in a way that pleases God (Romans 8:2, 9).