I will try and help you, first raise the hood and smell ,do you smell gasoline if you smell alot you need to check for leaks just turn the switch on and don't try to crank it go look under the hood and look for a leak if you don't have any gasoline leaks we will move to step two, step two is pull a spark plug wire loose and hold it with a rag away from the engine but close to a metal part of the engine have someone turn the engine over to see if you get a spark jumping from the spark plug wire to the engine block if you have no spark at all you have and ignition problem, points have to be set right to have spark. I beleive your system has and electric fuel pump in the trunk you should be able to hear it run with the ignition switch only in the on position, , make sure you have no gasoline leaks under the hood before you do anything. if you see any wet spots that look like a leak make sure it,s not gasoline.be careful. for the engine to run properly you need fuel . and ignition, with what you are you are saying it sounds like the pump may have stoped working, turn the switch on and listen for the sound of fuel pump working.also if it back fired when you tried to move it you have problem most likely in the ignition system.