My 1996 Nissan Altima Won't start, The battery is Fine But When I push in the clutch and turn it over it doesn't do anything at all

Clutch safety switch maybe . There is a electrical circuit that won't let Battery voltage go to the starter unless the clutch pedal is pressed . The switch should be on top of the clutch pedal arm . You would need to lay on the drivers floor board an look up under the dash . Two wires , green with white stripe - this is the B+ side of the switch , the other side is black . trying to start the vehicle there should be battery voltage , you can use a volt meter to test it . You can also check the other wire as well . If there is no B+ voltage , up stream from the clutch switch is a clutch interlock relay . Here is a web site for free wiring diagrams , do you know what they are ?
http://www.bbbind.com/free_tsb.html Enter the vehicle info. Year , make , model an engine size . Under system click engine , then subsystem click starting . Click the blue link .You will see the ignition switch , the other things i mention . Do you know how to use a DVOM - digital volt ohm meter ?