v1-5: Paul's opening comments are largely things agreed by Jews.
v1: He addresses the Jews respectfully, as fathers and brothers; see 2.14.
v2: He uses the Aramaic language; presumably he usually spoke Greek.
v3: His upbringing; a Jew, brought up in Jerusalem, at the feet of Gamaliel, taught according to the strictness of the law, zealous towards God, "as any of you are today," thus identifying with his hearers.
Paul does not change his mind by his own choice, but because he meets Jesus Christ; this is not something that he sought.
v4-5: Paul describes his commitment to attacking Christians, which took him on his journey to Damascus.
v6-13: Paul describes his conversion; he truthfully explains what happened; he cannot deny what happened, nor does he want to; and no-one can deny that he is a changed man.
There are apparent differences in details, (compare v9 with 9.7), but this is to be expected, for Paul is still human. The key fact is that Paul alone saw and heard the Lord Jesus. His companions were afraid because they did not know what was happening; they certainly did not enter into the same spiritual experience as Paul did.
v14-21: Paul's new ministry, introduced through Ananias.
v14: God has revealed His will to Paul, to "see the Righteous One," whom we know as Jesus Christ, the Messiah.
v15: The ministry of apostleship, the witness to all kinds of people; Paul avoids using the word 'Gentile' here, knowing it will inflame his hearers.
v16: The call to baptism, which is Ananias' initiative, not Paul's.
v17-20: The later vision in Jerusalem, not recorded in chapter 9. This does confirm his call to serve God amongst the Gentiles.
v21: The special call to minister to the Gentiles; and this is particularly obnoxious to the Jews.
v22: Jewish reaction is strong; that Paul should not even live. This exposes a seriously bad attitude; no wonder there are struggles throughout Acts between new and old covenants.
v23-24: The commander lacks understanding, evidently not being familiar with matters of Judaism. Yet again, through him, Paul's life is preserved.
v25-29: Since Paul is a Roman citizen, he avoids being flogged; see also 16.37-40.
v30: The commander exercises his authority, even asking the Sanhedrin to assemble to discuss the matter of Paul.