You say it won't turn over. Then your problem is with the battery, ignition switch, or starter. If you hear a click, click, click, then the battery is dead. If you hear nothing then it may be a bad ignition switch. Turn on the headlights and then attempt to start the engine. If you hear a click, the lights dim, and it will not turn over, the starter is suspect. Check the voltage at the battery with a voltmeter set to DC voltage on the 20 volt scale. These are the readings you look for.
If your battery is not reading at least 12.2 volts it needs charging or replacement. If the battery is over 3 years old, it more than likely needs replacing.
Now if I am missing what you are saying and the engine does turn over but will not start then turn on the ignition without trying to start the engine. You should hear the fuel pump run for a few seconds and then shut down. If you do not, then the fuse may be blown or the fuel pump relay may be defective. The fuel pump itself may also be bad. You may have to open the fuel filler door and remove the cap and listen at that location while someone else turns on the ignition in order to hear the pump running.