Hello I just bought 1972 220D for $800 in mint condition and need to know how often do I change these;

Oil Filter Change?
Oil Change/What Type?
Fuel Filter?
Glow Plugs?

Should I use fuel conditioners? Injector Cleaners?
Any known major failures on these models?

I dont know exact mileage on the car but the engine compression is extremely good when going down the hill in third!

Thanx

Mario S
Edmonton Canada