The Orthodox Church is the original Christian Church founded by Jesus and continued by his Apostles. It is the same Church described in the Bible as the Body of Christ and the Bride of Christ (1 Corinthians 12 : 27; Ephesians 5 : 23–25). Throughout its 2000-year history Orthodox Christianity has remained faithful to the teachings and practices passed on from the Apostles and early Church Fathers (2 Thessalonians 2 : 15).
This book, 'These Truths We Hold - The Holy Orthodox Church: Her Life and Teachings' is a great source of information on Orthodoxy. By clicking on the image you may read excerpts from it it in electronic form by subject. It was out of print for a long time but it is thankfully now available again from St. Tikhon's Monastery Press