Door ajar light is on when all doors are shut, fuel guage reads empty and dummy light is on saying get gas, all lights in the rear do not work i.e. brake, running, reverse, blinker, hazards. 15 amp fuse in panel continues to blow, so something is grounded/shorted. All problems occurred simultaneously. also, car won't shift out of park when started, have to start in neutral and then shift into gear to drive it.

If the door ajar light is on, it could be bad door switch
If the vehicle doesn't start in park, you could have a bad park/netural safety switch.
If none of the back lights work, and fuse keeps blowing, there is a short somewhere. Possibly in the switch. Try one size bigger fuse but no bigger than that.
Wouldn't be a bad idea to have your cars computer's code scanned which many part stores will do for free to see if there are any codes/errors that pop up.

Your stop light switch is broken and shorting out hence it will not start in park ,or you have a fitted the wrong bulb in one of the back lights like a twin connector bulb in place of a single or visa versa ,which is blowing the stop light fuse ,with this fuse blown your stop light switch isnt working hence you cannot get it out of park .also flasher could be using the same fuse as the stop lights .side lights should work but if wiring is being shorted out then anything is possible