You could start with the Greek Orthodox Archdiocese of America for a good introduction and overview.
www.goarch.org
I use a PDF version of the Greek Orthodox Study Bible. It offers a lot of interpretation of scripture as Orthodox Christianity believe.
The faith goes back to the time of the Apostles. There was a schism with the church in Rome that separated it away from the Pope.
Yes, there is a Patriarch at the Greek Church in Constantinople (Istanbul) who serves as the spiritual leader, but without the power of the pope. Roman Catholics believe the pope has divine, universal control over the church. Orthodox call the Patriarch the "first among equals".
While it is true that Greek was the predominant orthodox church, Eastern Orthodox is comprised of churches around the world, Romanian, Egyptian, Orthodox Church of America, Ukraine, Romania, Greece, Belarus, Serbia, Bulgaria, Georgia, Moldova, North Macedonia, Cyprus, and Montenegro, etc.
We...at least I...try to follow the teachings of Christ, but it is also like any religion, sometimes, you have good, compassionate understanding priests, sometimes you don't.
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