Yep! Take it to a lawn mower repair shop and have them look at it, and then have them fix it. Too many things to go wrong, and when we would have to figure it out--it would be impossible.
Hear this: If it sat outside all winter, uncovered, there might be several issues preventing it from running or moving.

More than likely you have a belt or pulley issue. The rear idler or VS pulley could have seized and sometimes in storage the belts will actually rust to the pulleys and won't turn. This is because they slowly pick up metal from the pulleys. In the same spirit, the brake could be locked. You could start by pulling the battery which will give you access to the rest of the drive system. Pulling the deck will make your life easier as the traction belts both will need replacement now.