My suggestion is to get the correct name of the manufacturer, (Blodgett maybe?) model number, and serial number and call the manufacturer or an authoirzed service provider, and get the scoop from them. They should be able to tell you typical maintenance needs, high-fatality parts, and what to watch out for better than anyone.
You may be looking at items like replacing deck parts, thermostat parts, hinges, along with a host of other items. They may even be able to pull up a service history for you to see if & what has been replaced, and a general idea of what shape it was in when it was in it's working place.