Put in a new thermostat and radiator cap.
These are a little difficult to get the air out of them.
Fill it with water only (I use distilled) and test it for a few minutes, shut it off and let it cool.
Do this two or three times, Probably be fine.
Does the cooling fan run, this is stupid common. The fan motor is really inexpensive, as are the stat and the cap.
Once you have it figured out, replace the water with coolant and drive it til' the wheels fall off.
GT