Your selling price will be determined by condition, location, and urgency to sell. Tractorhouse.com will give you and idea of comparable tractor prices. If you try to sell as is, expect no more than half of what it would bring if it starts and runs. Setting 10 years, definitely needs a battery, most likely carburetor work and sidewalls of the tires are most likely cracked from setting. The tires will have a flat spot if and when they roll again even if the tread is good. That makes for a rough ride.