Looks to be in nice shape. Plow adds about $500/$600 to the tractor. If you can lift the blade with the hydraulics to get it out of the barn then there's probably not much wrong with the three point, same system. You have a sherman combo. Push down for low and back towards operator for high. To access regular gear put lever in middle neutral detent then move the lever outward away from the body of the tractor. It will come out about 3/8" to 1/2" than move the lever back toward the operator, This will give you your regular standard gears. You can also look into red coating the gas tank, might save you a couple of bucks also a used tank in good condition from someone parting out a tractor.
Good luck with your new tractor