Diesel or Gas? Diesel has a higher resale value, but a gas tractor is easier to work on.
Check the tires thoroughly! Call a tractor tire outlet and get a price on a new tire, that same size!
3 point hitch, broken casting, rusted out rims, hours (like an odometer, measures hours run, instead of miles), repair history, .......
Try a Google search on that particular tractor.
YOU NEED A MENTOR! There has got to be someone, local and knowledgeable , you can trust to look at it with you.