Two good books you can start with: Seeking Spiritual Direction by Fr. Thomas Dubay, S.M., published by Servant Publications; and The Spiritual Life: A Treatise on Ascetical and Mystical Theology by Adolphe Tanquerey, S.S., D.D., published by TAN.
A spiritual director advises you along the way to union with God. The pathway is typically divided into the purgative, illuminative, and unitive ways. We often cannot perceive our own flaws objectively, or even at all.
God bless you.