Re: i really need help!!
If your manual is like mine, it's useless as it is based on the Ritual version.
Basically, as Michele said, theres Tour of Duty and Deleted Scenes. To play Ritual's Deleted Scenes you need to choose the 'Condition Zero Deleted Scenes' application, and then 'New Game or World Map' from the main menu.
For Turtle Rock's CZ, choose the normal application like you have done. The main menu is like this.
Play CS Condition Zero: Enter Tour Of Duty mode (single player bot match challenges).
New Custom Game: Start your own match with settings such as map, time limits etc. as well as setting bots in game.
The rest of the options in the main menu are self explanitory.