I have a Toro model 20464 self propelled mower. It has set up for a year without being started. When I tried to start it, it was not getting fire. I have put put a new spark plug in and used fresh gas, but there is still no spark. What should I do next?

Sounds like to me that it needs to be cleaned try sanding the coil and the flywheel

Hi,
Sitting for a year leads to gummed carbs. "Fire" is what is often said when it does not start since you cannot hear the spark except with the plug out, grounded and in a quiet place.
Peace,
Clarke