If the fuel and oil are a couple of years old I would certainly get those items taken care of.Be sure the air and fuel filter are fresh,the battery is good, cables are clean, other than that it will be a matter of routing vacuum lines and getting the vehicle running well. You may want to be sure the PCV system is functioning properly and the throttle plate and AIS are clean.After the vehicle is running well start checking all the basics,plugs, cap rotor, wires, cooling system including coolant condition, hoses, thermostat, belts.
I would not start replacing a lot of parts yet(unless something fails and you have to) until the vehicle is running well and you know everything works otherwise if something happens you may not know what caused it.
It sounds like the vehicle has been driven, are any fault codes set? If you are having vacuum problems there may be a couple in there from that.