Thousand years is mentioned 6 times in 20:2-7, once in each verse: Satan bound; unable to deceive; those beheaded because of testimony came to life; rest of dead came to life after 1000 years; those in first resurrection reign with Christ; "When the thousand years are over, Satan will be released...to deceive the nations in the four corners of the earth... But fire came down from heaven... And the devil...will be tormented day and night for ever and ever." (20:7-10).
In 20:11-15 everyone is judged "according to what they had done." "If anyone's name was not found written in the book of life, he was thrown into the lake of fire." (20:15).
For some ideas on what God's People may be doing during the 1000 years, while Satan is bound, look at items under The New Era.
See the September 2007 addendum on the What's Next page