If there's no fire to your plugs you need to use a volt meter with the points open and the ignition switch in the "on position" and see if you have voltage to your coil. If there's no voltage at the coil you're not getting voltage from your switch. It could be defective or you're not getting voltage to your switch. Could be a loose or broken wire feeding your switch.
If there's no voltage to your coil you can bypass your ignition switch by running a separate wire from your battery to your coil then see if it will start.
If you have voltage at your coil check the point gap and if looks ok replace the condenser. If you have fire to your plugs you need to check your fuel system. An easy way to see if its a fuel problem spray a small amount of carburetor cleaner into the air intake while a helper makes an attempt to start the engine. If the engine fires its not getting gas. Hal