Possible meanings are that this "angel" is 1) a heavenly angel who protects this church or 2) a human messenger to the church, either a messenger who went from John to the church or the leader of the church. See how you translated "angel" in [Revelation 1:20](../01/20.md).
This is the name of a city in a part of western Asia that today is modern Turkey. See how you translated this in [Revelation 1:11](../01/11.md). (See: [[rc://en/ta/man/translate/translate-names]])
This refers to the eternal nature of Jesus. See how you translated this in [Revelation 1:17](../01/17.md). (See: [[rc://en/ta/man/translate/figs-merism]])