Welp, I got the garage in a lot better shape, but it still needs work. Changed the plugs and the air filter on the riding mower and charged the battery until the charger said it was charged. Still wouldn't start. It cranked over good for about 10 seconds and then gave out. The battery is four years old so I got a new one for 29 dollars and it fired up! Now I only need to sharpen the blades and maybe change the oil and filter. The book says change it every 50 hours and it's got ten more to go. I'll check it out tomorrow.
The push mower fired up after a shot of starter fluid so it's good but the tiller is another story. I doused it with starting fluid and it starts but won't stay running. So that means it ain't getting fuel. A good guess would be the carb is gummed up. I'll deal with it after I mow friday.