Check your starter. Have someone turn the ignition to the "start" position and put a test light on the "S" terminal. If it lights up and the starter doesn't do anything then you need a new starter.

The "S" terminal is the small stud with a wire held on by a nut on the starter solenoid.

Hit the starter if you don't have any of that stuff while someone is trying to start it. That might work, too.

If the light doesn't light up then you have to work your way back on that circuit.

EDIT: And if your coolants even a little low, pull out your spark plugs before starting it. It could be hydro-locked.

"Treat a human being like a human being, you'll be suprised what happens".