Ephesus was an important city in ancient Asia Minor. It was a port city and had several major highways emanating from it, making it important economically in its day. It was also the center of pagan worship with the temple of Diana. It also was a cultural center with a major theater, a library, and an assortment of fountains, civic buildings, and public baths.
Because of its cultural import, the church planted there by Paul also quickly grew to prominence under his three-year ministry. So the man that would replace Paul as leader of that church would also become significant and important. So Paul wrote two letters to the young pastor of that church, Timothy, his protege in the faith.
These letters offer instruction to Timothy on how to lead that church in particular. And they offer direction to all church leaders everywhere for how to lead their churches.
Paul organizes his thoughts around basic reminders of the foundations of ministry. Foremost is the foundation of Biblical instruction (teaching) in chapter one. Establishing teaching as the focus of ministry, Paul then discusses the practical out-working of that focus in the context of the church (chs. 2-3) and the individual (chs. 4-6).