Jesus explained to Saul that when he persecuted the church then he was persecuting the recently risen Lord.
He submitted to the Lord and asked what he should do. Salvation does not come from works, but Saul was showing his submission to the Savior through obedience. Jesus told him to get up and go to the city. This is how we should respond to the Lord when he asks us to do a work for him and to live for him, we shouldn't complain or ignore. Jesus did not tell Saul everything that would happen in his life in the future, only what would come next. Saul submitted.
The experience left him unable to see but obedient and willing to do what he said. He was led into the city to encounter Ananias. Though Ananias had heard much about Saul and was just a little scared, he took it with a grain assault and obeyed the Lord and took Saul in. Ananias laid hands on Saul and healed him of his blindness. Saul was a devout Jew and knew what God's Word said but to his previous conversion with the Lord, he did not believe that Christ was the anointed Messiah. As soon as he believed he began to preach Christ in the synagogues. After spending three years in Damascus Saul went to Jerusalem to meet with another apostle and stayed there for twenty years he started churches in Asia and in Europe. .
The calling out of Barnabas and Paul.
Saul had been on the receiving end of the persecution. (Acts 13) Others in the church began to hear about Saul and bring him into their congregations. He also started going by the name Paul more. Then church in Antioch wanted to send out missionaries to preach and fulfill the works for Christ. Barnabas and the growing Christian Paul were the chosen ones to go. Barnabas was the leader and Paul was the disciple. Paul began to take a more active role in leadership and direction for their traveling ministry. There was only one other time before Paul was seen as more of a leader when the team was referred to as Barnabas and Paul.