Keep an eye on the furniture and items that you need to protect. Don't get distracted by all the little rats running around, or your game's over.
Get a feel for gameplay
Be sure to run through the single-player game first to get a feel for the gameplay. It's hard enough for two or more experienced players to play a multiplayer game, let alone to learn the game.
Mouse
If you have a PlayStation mouse, use it for this game.