For centuries humanity has sought the key to life and death. Only Jesus has the key. One of the keys is the key to hell (Hades). Note the following verses:
When a person has keys, this indicates that this person is either a owner of the property or has authority on that property. Christ owns the universe, and He has authority over all things—even Hell.
These verses serve as an outline for the rest of Revelation.
The things that thou hast seen—Revelation 1
The things which are—Revelation 2-3
The Things Which shall be Hereafter—Revelation 4-22
The seven stars are the angels of the seven churches. The seven candlesticks are the seven churches. Some say these angels are the “pastors” of these churches. Some say they are just what the word says—angels.