The Orthodox share the belief of all Christians that Christ is the only mediator for the reconciliation between man and God.
The Church believes that the Saints, having prayed for the members of the Church while on earth, do so in Heaven. But you are right: the intercession of the Saints for the moral uprgithness and betterment of the Militant members is not clearly stated in the Scripture.
Angels, on the other hand, who are also created beings, intercede (Zech 1:12-13)
Likewise, the icons and relics are honored as pious and righteous men and women of God, worthy of our respect, many of whom have died martyr's death for faith. Icons were found in the catacombs and early church walls. John of Damascus, a towering theologian, set the correct usage of icons: "honor which is given to the icon passes on the the prototype." They help imitate the virtues of the saints to glorify God. Icons are monuments.
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And windows onto the Kingdom. Iconodules do not look so much upon icons as through them -- just as, in your Bible school you all understood that the stories were not about two-dimensional pieces of felt, but rather the subsiding realities that St. John Damascene calls their prototype.