By first discussing the matter with an Eastern Orthodox priest or bishop. Then you may need to receive instructions in the beliefs of the Orthodox Church, and later you may need to be Baptized/Chrismated into the Faith.
No.
No. When Prince Vladimir chose to become a Christian, he joined the Orthodox Church. His pagan subjects were therefore required to join the Orthodox Church.
People join an Orthodox Church because it is the only church that directly leads to Jesus Christ himself. So people who search for the true faith will evetually end up in the One Holy Catholic and Apostolic church. This does not mean that all other christian sects will not find salvation.
There is an Orthodox Church and a Catholic Church. There is no Catholic Orthodox Church.
Eastern Orthodox Church (or the Christian Orthodox Church).
No, the Greek Orthodox church is a part of the Eastern Orthodox Churches.
Anglican Orthodox Church was created in 2001.
The Orthodox Church of Greece (Eastern Orthodox Church).
Its a faith (church). Bulgarians follow Orthodox church
The Coptic Orthodox Church
The Romanian Orthodox Church mainly follows the liturgical practice of the Greek Orthodox Church, rather than the Russian Orthodox Church, such as the use of the new calendar.
Catholic AnswerThis is known in the Catholic Church as apostasy and is an automatic excommunication. If there is something you feel drawn to in the Greek Orthodox Church, then you should look into the Greek Uniate Church with is the part of the Greek Church which has always been in union with Rome (even after the Greek Orthodox left the Church). You may attend Greek Uniate Sacraments with no special permission, but to officially change Rites, you would need to apply to your Bishop and their Bishop.