Getting my new Cub Cadet riding mower to start. It tries to turn over but wont

If this is the first time you have tried starting it after gas sat in it for a few months, you most likely have a strong battery, but a gummed up carburetor. You can always start simple: change out your gas filter, loosen the screw on bottom of carb and drain out all gas, then tighten it back up and put in gas with some SeaFoam and cross your fingers. If that fails to work, you may have to remove your carb and clean out the jets. This video may help with that: https://www.youtube.com/watch?v=cViIbkt7M3w

I hope this helps you out!

Have the battery tested.