What’s the first thing Paul did after his conversion.
Act 9:19 and taking food, he was strengthened. For some days he was with the disciples at Damascus.
Act 9:20 And immediately he proclaimed Jesus in the synagogues, saying, “He is the Son of God.”
Act 9:21 And all who heard him were amazed and said, “Is not this the man who made havoc in Jerusalem of those who called upon this name? And has he not come here for this purpose, to bring them bound before the chief priests?”
Paul and Barnabas:
Act 13:5 When they arrived at Salamis,
they proclaimed the word of God in the synagogues of the Jews. And they had John to assist them.
And at Antioch Paul went into the synagogue and preached Jesus as their Messiah, and his entire sermon to them is given:
Act 13:13 Now Paul and his companions set sail from Paphos and came to Perga in Pamphylia. And John left them and returned to Jerusalem,
Act 13:14 but they went on from Perga and came to Antioch in Pisidia. And on the Sabbath day they went into the synagogue and sat down.
Act 13:15 After the reading from the Law and the Prophets, the rulers of the synagogue sent a message to them, saying, “Brothers, if you have any word of encouragement for the people, say it.”
Act 13:16 So Paul stood up, and motioning with his hand said: “Men of Israel and you who fear God, listen.
Act 13:17 The God of this people Israel chose our fathers and made the people great during their stay in the land of Egypt, and with uplifted arm he led them out of it.
Act 13:18 And for about forty years he put up with them in the wilderness.
Act 13:19 And after destroying seven nations in the land of Canaan, he gave them their land as an inheritance.
Act 13:20 All this took about 450 years. And after that he gave them judges until Samuel the prophet.
Act 13:21 Then they asked for a king, and God gave them Saul the son of Kish, a man of the tribe of Benjamin, for forty years.
Act 13:22 And when he had removed him, he raised up David to be their king, of whom he testified and said, ‘I have found in David the son of Jesse a man after my heart, who will do all my will.’
Act 13:23 Of this man's offspring God has brought to Israel a Savior, Jesus, as he promised.
Act 13:24 Before his coming, John had proclaimed a baptism of repentance to all the people of Israel.
Act 13:25 And as John was finishing his course, he said, ‘What do you suppose that I am? I am not he. No, but behold, after me one is coming, the sandals of whose feet I am not worthy to untie.’
Act 13:26 “Brothers, sons of the family of Abraham, and those among you who fear God, to us has been sent the message of this salvation.
Act 13:27 For those who live in Jerusalem and their rulers, because they did not recognize him nor understand the utterances of the prophets, which are read every Sabbath, fulfilled them by condemning him.
Act 13:28 And though they found in him no guilt worthy of death, they asked Pilate to have him executed.
Act 13:29 And when they had carried out all that was written of him, they took him down from the tree and laid him in a tomb.
Act 13:30 But God raised him from the dead,
Act 13:31 and for many days he appeared to those who had come up with him from Galilee to Jerusalem, who are now his witnesses to the people.
Act 13:32 And we bring you the good news that what God promised to the fathers,
Act 13:33 this he has fulfilled to us their children by raising Jesus, as also it is written in the second Psalm, “‘You are my Son, today I have begotten you.’
Act 13:34 And as for the fact that he raised him from the dead, no more to return to corruption, he has spoken in this way, “‘I will give you the holy and sure blessings of David.’
Act 13:35 Therefore he says also in another psalm, “‘You will not let your Holy One see corruption.’
Act 13:36 For David, after he had served the purpose of God in his own generation, fell asleep and was laid with his fathers and saw corruption,
Act 13:37 but he whom God raised up did not see corruption.
Act 13:38 Let it be known to you therefore, brothers, that through this man forgiveness of sins is proclaimed to you,
Act 13:39 and by him everyone who believes is freed from everything from which you could not be freed by the law of Moses.
Act 13:40 Beware, therefore, lest what is said in the Prophets should come about:
Act 13:41 “‘Look, you scoffers, be astounded and perish; for I am doing a work in your days, a work that you will not believe, even if one tells it to you.’”
Act 13:42 As they went out, the people begged that these things might be told them the next Sabbath.
This is repeated over and over throughout Acts.
Paul preaching Jesus in the synagogues, and preaching Jesus in Greek cities to the gentiles.
That was his mission, given Him by Jesus.