Most Orthodox Christians initially use the local priest as their spiritual father, indeed I would state that for most Orthodox Christians their spiritual father is their pastor. Those who live near a monastery may find a good fit with a monk (or a spiritual mother, like a nun) later on. Occassionally one goes first to a monastery on a retreat and is attracted to a monastic spiritual guide there before they have actually attended an Orthodox Church.
A spiriitual father---the actual term is more appropriately called a spiritual director , may actually be a clergyman, a religous (nun or monk), or a very spiritual layperson whose is able to meet with you on a regular basis to discuss where you are spiritually in your life and where do you go next. The purpose of Orthodox spiritual direction is to deepen your relationship with the Most Holy Trinity, to learn and grow in your own personal spirituality. The person seeking direction shares stories of his or her encounters of the Lord in the past and how he or she is experiencing spiritual issues. One of the reasons that a spiritual director is often, but not always, a priest is that confession is a part of the spiritual direction process. The Orthodox spritual director listens and asks questions to assist the directee in his or her process of reflection and spiritual growth. The spiritual director will assign readings, spiritual practices (like the Jesus prayer), and other exercises and disciplines for you to accomplish before the next session. regular reports are given to the spiritual director so the director may provide adjustments of the direction that will edify you and help you to develop spiritually. A spiritual directors will also be under spiritual direction and obedience from their own spiritual director.
Within Orthodox Christianity, spiritual direction has its roots in the Early Church. The gospels describe Jesus serving as the Spiritual Director and Savior to his disciples. Additionally, Acts of the Apostles Chapter 9 describes Ananias helping Paul of Tarsus to grow in his newfound experience of Christianity. Likewise, several of Pauline Epistles describe Paul's spiritual direction of both Timothy and Titus among others. Tradition tells that Saint John the Evangelist was the spiritual director of Saint Polycarp, the second-century bishop of Smyrna.
John Cassian who lived in the fourth century provided some of the earliest recorded guidelines on the practice of spiritual direction. He introduced spiritual direction in the monasteries. Each novice was put under the care of an older monk. Benedict of Nursia integrated Cassian's guidelines into what is now known as the Rule of Saint Benedict. St Symeon the New Theologian was a monk-poet who embodied the mystical tradition. He wrote that humans could and should experience God directly. His works deeply involved hesychastic practices which, according to St Symeon should be undertaken only with a spiritual director.
This prayer from From Orthodox Psychotherapy" by Metropolitan Hierotheos of Nafpaktos may be helpful as you try to find a spiritual father:
"O Lord, who desirest not the death of a sinner but that he should turn and live, Thou who didst come down to earth in order to restore life to those lying dead through sin and in order to make them worthy of seeing Thee the true light as far as that is possible to man, send me a man who knows Thee, so that in serving him and subjecting myself to him with all my strength, as to Thee, and in doing Thy will in his, I may please Thee the only true God, and so that even I, a sinner, may be worthy of Thy Kingdom". —St. Symeon the New Theologian (SC 129,186-188).