After Paul spent considerable time in places like Arabia, Damascus, and other Gentile nations preaching and planting churches, he returned to Jerusalem to speak to the brothers about a revelation he had.
Fear weakens one’s faith, but when we trust in the Lord, He will strengthen our faith to continue to walk in faithfulness.
Judea was the capital of Jerusalem, and James, the brother of Jesus, was one of the leaders there…
The most likely reason why Paul decided to visit James was that he was the leader of the church in Jerusalem, see Acts 21:17-18.
After three years of Paul’s conversion to Christianity—having an encounter with Jesus Christ, after His resurrection and ascension to heaven, see Acts 9:1-6, he visited Peter.
After Paul received the Holy Spirit and got baptized, he spent many days with some of the disciples in Damascus, see Acts 9:10-19.
The phrase “to reveal His Son in me” refers to Paul being used by the Holy Spirit, after conversion, to tell people about Jesus Christ and what He did for everyone on the cross.