Here is an audio series that Dr. McLain presented at Northside Bible Church from January 13 through September 28, 1980 on The Acts of the Apostles. This chapter by chapter study covers 36 lessons on Acts which is crucial to your understanding of right division. This study was given prior to Dr. McLain publishing the book "Rethinking the Acts" in 1984. Acts is such a crucial book to understand the transition of God's plan of salvation from the Jew to the Gentile.
Acts Study - Part 21. This lesson covers Acts 15:36-41 thru 16:1-15. 36 And some days after Paul said unto Barnabas, Let us go again and visit our brethren in every city where we have preached the word of the Lord, and see how they do. 37 And Barnabas determined to take with them John, whose surname was Mark. 38 But Paul thought not good to take him with them, who departed from them from Pamphylia, and went not with them to the work.