Prayers
The Hear Me Prayer Book is an excellent collection of Orthodox Prayers for Teens and Young Adults. It's a great guide for your daily prayer time. Also check out Prayers by the Lake by St. Nikolai Velimirovich, who served as a Bishop here in America. These are beautiful prayers for contemplation and can help lighten the heart.
Orthodox Spirituality
Below are some great books on living the Orthodox life. Anthony Bloom's Beginning to Pray is not just for beginners, but also for everyone on the path of prayer. Our Thoughts Determine our Lives is extremely helpful in understanding how our inner lives, our thoughts and our feelings work for or against our overall spiritual life. Acquiring the Mind of Christ is another helpful guide to navigating the modern world while living the faith of the original Christians.