Paul was a Jew of the tribe of Benjamin.
He was also a Roman citizen having been born in Cilicia.
He was originally called Saul.
He was a Pharisee, taught by Gamaliel.
We first meet him in Acts 7:58
Acts 7:58 And cast him (Stephen) out of the city, and stoned him: and the witnesses laid down their clothes at a young man’s feet, whose name was Saul.
Acts 8:1 And Saul was consenting unto his death. And at that time there was a great persecution against the church which was at Jerusalem; and they were all scattered abroad throughout the regions of Judaea and Samaria, except the apostles.
Paul persecuted Jews who believed and obeyed the gospel at Jerusalem.
Acts 8:3 As for Saul, he made havock of the church, entering into every house, and haling men and women committed them to prison.
He wanted to do the same at Damascus.
Acts 9:1 And Saul, yet breathing out threatenings and slaughter against the disciples of the Lord, went unto the high priest, 2 And desired of him letters to Damascus to the synagogues, that if he found any of this way, whether they were men or women, he might bring them bound unto Jerusalem.
On the road to Damascus Jesus met him and he was subsequently converted and baptised.
Jesus had ordained him to be an apostle to the Gentiles (non-Jews).
This is recorded in Acts Chapter 9.
He was given the same Holy Spirit powers as the other 12 apostles and received instruction directly from Jesus.
His missionary journeys are described in the Acts of the apostles.
He wrote letters to Churches established at Rome, Corinth, Galatia, Ephesus, Philippi, Colossae, Thessalonica, also to Timothy, Titus, and Philemon.
I hope you find this helpful.