Rosters are 28 players: 14 hitters 9 pitchers and 4 reserves. 2 c, 1 1b, 2b, 3b, SS, 1 MI, 1 CI, 5 OF, 1 DH (Anyone)
There are no restrictions to who can be on your roster (NLers, Minor leaguers, etc)
Roster periods are every week on tuesday before 1st game time.
A player is eligible for a position if he has played 10 games in 2010 OR 20 games in 2009 at that position OR if CBS lists him as eligible.
You may play a player out of position whenever you choose. If by the end of season that player is not eligible for any period you played him at a position he did not qualify, all of his stats are removed for those periods.