Canonization of the Hebrew Bible discusses the history and formation of the Hebrew Bible.
The writers of the New Testament completed their manuscripts within about 60 years of Jesus' crucifixion. Before original writings were found, we had approximately 15,000 complete manuscripts or partial quotations of the New Testament today that were written or copied within the first several hundred years following Christ's death--thousands more than any other writings from that era.
(FaithQuest - Student Edition (DP) by Sharon Berry and Ollie Gibbs (2008). Page 7.)
Structure
27 books in total.
The Gospels (Matthew, Mark, Luke, John) are historical, telling the life of Christ and the results of the Great Commission and effects of the Holy Spirit. God's plan of redemption is fully revealed in these books.
The Acts of the Apostles is also historical.
The epistles were the next 13 books, written by Paul and apostles and apostolic men to explain God's plan of redemption. 9 were addressed to Christian churches (Romans, 1 and 2 Corinthians, Galatians, Ephesians, Philippians, Colossians, 1 and 2 Thessalonians). All these books describe Christian doctrine and its application to life. The next four (1 and 2 Timothy, Titus, Philemon) are personal and focus on godly counsel. The last nine are general epistles, all speaking to Jews who have become Christians and are experiencing persecution.
Revelation is the final and only prophetical book in the New Testament, describing the end of the world and Jesus' second return.
(FaithQuest - Student Edition (DP) by Sharon Berry and Ollie Gibbs (2008). Pages 7-8, The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. Biblical Languages by Larry Walker. Section One: The Authority and Inspiration of the Bible. Page 9)
Theme
Practical instruction for Christians. Paul wrote in 1 Corintians 10:11: Now these things happened to them as an example, and they were written for our instruction, upon whom the ends of the ages have come.
If the OT records what "God spoke of old to our fathers by the prophets," the NT record the final word He spoke to His Son, summing up, confirming, and transcending the earlier revelation. Jesus is also man's perfect response to God - the high priest as well as the apostle of our confession. Hebrews 3:1: "Therefore, holy brothers and sisters, partakers of a heavenly calling, consider the Apostle and High Priest of our confession: Jesus."
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. Biblical Languages by Larry Walker. Section One: The Authority and Inspiration of the Bible. Page 7-8)