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https://studentshare.org/religion-and-theology/1667525-theology.
The first and most significant change that happens to the disciples is the coming of the Holy Spirit (Chapter 2). It came down on them in the form of tongues of fire while they were praying. It gave them the power to perform miracles and guided them in their relations with God and among themselves. Another event that happened to the followers was the formation of prayer fellowships. They gathered to pray each day (chapter 4). It is attributed to the fact that they realized Jesus was not with them, and to practice His teachings, they had to pray for unity. The fellowships brought into existence, the early church. Believers were first called Christians at Antioch (Chapter 11).
Another change is that the disciples were persecuted. Peter was arrested on several occasions and put in jail. During his detention, the rest of the disciples prayed and the angel of God released him from jail (Chapter 12). James, the brother of Andrew, was beheaded (Chapter 12) while Stephen was stoned to death because of their faith in Jesus (Chapter 6). The church grew in size, and the disciples dispersed to all parts of the world to preach the gospel of Christ.