Buying a used car is usually the smart money move, but only if you check the right things first. The two most common mistakes are buying on looks and skipping the history. A clean interior says nothing about the engine, and a low price often hides a problem.
Ask for the service history and any roadworthy or inspection report. Confirm the odometer reading matches the paperwork, and check that the seller is the registered owner. A vehicle with no service records isn't automatically bad, but you should factor the unknown into your offer.
Get the car inspected by an independent mechanic before you commit; a couple of hundred dollars now can save thousands later. Then use any faults you find to negotiate, and always confirm the final price, inclusions and transfer process in writing.