Save your money, buying from a yard you will be paying top dollar for a average car, also interest will add 30% to the price, and then you will need full insurance, factor in a grand or two for that if you can get it due to your age or mods on the car.
If you buy privately you may be able to buy a better car for less money, its a buyers market.
Don't buy a rolling defect with a body kit and 20" rims, buy a neat car with sensible mod,s, its better to have a car that looks stock but goes,stops and handles than a car that looks like its from FnF but gets blown at the lights by someones mum in their Camery.