Check the solenoid connection before you worry about anything else. It's one of a very few things that can result in the engine not even trying to turn over. Smallest wire going to the starter motor (red with blue or black stripe IIRC), simple 6.3mm spade connector in a plastic housing. Unplug it by pulling the housing. If the spade part on the solenoid is all crusty and dirty, clean it up; then reconnect and try to start it.
Small amounts of fuel will soon evaporate out of the bores if you leave the plugs out.