Jimmie, lineups are generally always consistant - and key pulls are reported. Pay attention to the night before, and each teams key player status. For instance, I havn't seen the lineups but I know Johnny Damon will not be starting for the Yankees tonight. I'm not a psychic, It's reported. Each team should only have 1-2 guys where it significantly changes your feel on the game, and these key guys are almost always in the lineup but pay attention.
Pay attention to starting pitching and bullpen status more. Pitching wins games.
Most importantly lines are good to hit pre game time as juice is always revolving, O/U especially. For example, I found only a few shops with a 10 run WAS line, by gametime I guarentee there will be 9.5 across the board and 10 is great # in BB.
Good luck on your plays.