4-Joseph Smith was called to be a prophet. He translated the Book of Mormon. Heavenly Father sent John the Baptist and some of Jesus' apostles to restore the priesthood that Jesus and the apostles had when Jesus was on the earth. This meant that people could be baptized, receive the Holy Ghost and go to the temple.
5-Today, our church still has the priesthood and we are led by a prophet named Thomas S. Monson who Heavenly Father tells what to teach us so we can be happy and return to live with Heavenly Father and Jesus Christ some day.