Alma chapter 6, gives us a formula for how we should preach the gospel:

“And Alma went and began to declare the word of God unto the church which was established in the valley of Gideon according to the revelation of the truth of the word which had been spoken by his fathers, according to the spirit of prophecy which was in him, according to the testimony of Jesus Christ, the Son of God, who should come to redeem his people from their sins, and the holy order by which he was called” (Alma 6:8).

Translation (as I read it):

1. with the scriptures/words of the prophets
2. with a personal testimony received through revelation
3. with a Christ-centered message of hope and redemption
4. with delegated priesthood authority in the form of a calling or assignment

Pretty straight-forward and simple pattern.