Since the Great Schism in 1054, Orthodox churches have predominately been in the Middle East, Northern Africa, Greece, Russia, Serbia, Romanian, the Ukraine, and other parts of Eastern Europe, but immigrants and Russian missionaries to Alaska brought the faith to North America in the 1800s. The Orthodox Church preserves the services, doctrine, and traditions of the early church, whereas churches in the West have continued to evolve and revise their beliefs.
If you are unfamiliar with the history and doctrines of the Orthodox Church, the What is the Orthodox Church? page reposts an excellent summary from a book excerpt. Additionally, these websites will give you more general information about the Church:
However, the best way to learn about the Orthodox Church is to attend the services. As the Apostle Phillip told the Apostle Nathaniel (John 1:43-50), “Come and see.”
This website will help you find a local parish in North America. If you are blessed to have several local parishes, I recommend giving them all a try. The services have essentially the same content, but the style of music, possibly language, and the local customs vary.