And Jesus came and spoke to them, saying, “All authority has been given to Me in heaven and on earth. Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all things that I have commanded you; and lo, I am with you always, even to the end of the age.” Amen.
When Jesus sent out His apostles to make disciples of all nations, they were prepared, equipped and anointed to impart all the teachings and commands that Jesus had given them.
"And with many other words he testified and exhorted them, saying, “Be saved from this perverse generation.” Then those who gladly received his word were baptized; and that day about three thousand souls were added to them. and they continued steadfastly in the apostles’ doctrine and fellowship, in the breaking of bread, and in prayers. "
The apostles didn't have any of the teachings of Jesus written down, they imparted everything that Jesus commanded and taught them orally to the new disciples that were converted to Christ. Jesus also told the apostles that the Holy Spirit would bring to their remembrance everything that He had taught them!
“These things I have spoken to you while being present with you. But the Helper, the Holy Spirit, whom the Father will send in My name, He will teach you all things, and bring to your remembrance all things that I said to you.
Why do we see so many carefully crafted sermons being preached today? Power point presentations and inspirational messages from many so-called ministers of the gospel.
The first century apostles preached the word of God and did all the ministry works of Christ by the anointing and power of the Holy Spirit! Nothing rehearsed, practiced or prepared days in advance, just the power of God in the moment, day by day, and soul by soul!