Dr. Martin Luther wrote a brief overview for his friend how to pray. Read it here: A_Simple_Way_To_Pray-v1-Luther

“This document represents Luther’s mature catechetical piety, the integration of theology and prayer in the context of catechesis. He shows here his long-standing attention to the practical concerns of the Christian life. His response to the question of his barber shows how the reformer viewed this kind of Reformation – believers living at the nexus of the Word of God, catechesis, and prayer. As a confessor of the faith, Luther recommends that believers ‘pray’ the chief articles of the church’s confession, that is ‘the Lay Bible’, as found in the catechism.” (William R. Russel, Praying for Reform. Luther, Prayer and the Christian Life. Minneapolis, Augsburg Fortress 2005 Pg. 71)