I am preparing for an open forum on eschatology.
Here is the main passage from Scripture that mentions the millennium.
Revelation 20:4-6
Then I saw thrones, and seated on them were those to whom the authority to judge was committed. Also I saw the souls of those who had been beheaded for the testimony of Jesus and for the word of God, and those wwho had not worshiped the beast or its image and had not received its mark on their foreheads or their hands. They came to life and reigned with Christ for a thousand years. 5 The rest of the dead did not come to life until the thousand years were ended. This is the first resurrection. 6 Blessed and holy is the one who shares in the first resurrection! Over such the second death has no power, but they will be priests of God and of Christ, and they cwill reign with him for a thousand years.
Here's a nice summary of the different views on the millennium by Michael Horton.
Christ will return prior to the millennium according to the premillennialists and after the golden era according to the traditional postmillennialists. Amillennialism, however, understands the reference to a one-thousand-year period as figurative for the era between Christ's two advents. Premillennialism anticipates increasing decadence in the condition of the world (including the visible church) until Christ returns at the end of history to establish his kindom. Postmillenniallism expects things to improve gradually through God's gracious blessing on the church's missinary endeavors until the nations officially recognize Christ as Messiah and wars, famine, disease, and other global disasters gradually cease. It is then expected that Christ will return to receive his kindom, to judge the living and the dead, and to commence the everlasting state. Amillennialism expects simutaneous growth and decline, suffering and success, witness and apostasy throughout this era between Christ's two advents. (Michael Horton, The Christian Faith, p. 920)
