for buying a 2nd car, check for the history i.e when was the last service, when was the last timing belt change, condition of engine, accident free, tires, suspension, bushing,interior, aircon,seats and etc etc etc.
also depends what you are looking for in this car, comfort, performance, restore to original standard or just buy and drive.
The e36 318i(M) - M40B18 is a nice car to drive. Do not underestimate the manual because i have run a lot with others including the 147 and saga TURBO. So, it's no shy to have this car.
Anyway, do enjoy the car.