Amazed at the teaching about the Lord through Paul and Banabas

Acts 13:1-31
While they were worshiping the Lord and fasting, the Holy Spirit said, “Set apart for me Barnabas and Saul for the work to which I have called them.” So after they had fasted and prayed, they placed their hands on them and sent them off.
Then Saul, who was also called Paul, filled with the Holy Spirit,looked straight at Elymas and said...
Immediately mist and darkness came over Elymas, and he groped about, seeking someone to lead him by the hand. When the proconsul saw what had happened, he believed, for he was amazed at the teaching about the Lord.
From Paphos, Paul and his companions sailed to Perga in Pamphylia,where John left them to return to Jerusalem. From Perga they went on to Pisidian Antioch. On the Sabbath they entered the synagogue and sat down.  After the reading from the Law and the Prophets, the leaders of the synagogue sent word to them, saying, “Brothers, if you have a word of exhortation for the people, please speak.”
But God raised him from the dead, and for many days he was seen by those who had traveled with him from Galilee to Jerusalem.They are now his witnesses to our people.
From this point on in Acts, Paul is the central figure. The church at Antioch, directed by the Holy Spirit, selects its best men for pioneer work.
Barnabas and Saul, with young John Mark to help them, go first to Cyprus: Manabas' native island, where they confound magician Elymas and make a notable convert, the proconsul Sergius Paulus. Saul adapts the Roman version of his own name: Paul. From now on it is 'Paul and company', as he takes the lead.
They have barely begun their mainland journey when at Perga. John Mark returns home.
Why?
It is the Holy Spirit sent Banabar and Saul go our to preach gospel. So they placed their hand on them and send them off.
Paul has Holy Spirit with him so the power of God is with him, in his word, Paul has notable convert. For  proconsul  was amazed at the teaching about the Lord.
The leaders of the synagogue invited Paul to speak, how apostles witnesses among Jewish.
How?
Understand and follow the leading of Holy Spirit, God's work will be done in His way.