In Psalms 1 and 2, we see both a personal Psalm and a corporate Psalm. In the first Psalm, a Psalm of Wisdom, we see what a righteous man looks like, and then in contrast we see that a wicked man is blown away by the wind. In the second Psalm, a Kingly/Messianic Psalm, we see a picture of Jesus and how His apostles quoted this Psalm to tell us about Jesus. These two Psalms are an introduction to all 150 Psalms, and according to Dr. J. Stephen Yuille, we see four main themes that run throughout the Psalms are God's Way, God's Word, God's Rule, and God's King.
