Acts is the history of the early church. I do believe some things have changed since those days, so we cannot take it as normative. There is a progression in the book, which starts with the incredible miracle of the day of Pentecost in Chapter 2. Then the numbers added "daily" just get bigger and bigger. One thing that changes is that after the Jerusalem council in Acts 15, where Peter pushed for Gentiles to be circumcised and made into Jews, his name drops out of the book! Paul becomes the dominate force and the missionary who made a difference. It is interesting to study the history in Acts, with the various epistles that were written, to see when they fit in.
It is thought that Luke wrote Acts, as the second half of his account to Theophilus. The books were to be read together, but John somehow got wedged between them!