First car but what to buy cheap?

soon ill be 17 and applying for my provisional drivers licence, i would rather have my own car, but with no money its kind of impossible, i do have my uncle who pays for things i want, as i know how to drive already size would not matter as i am used to big cars anyway, but as my birthday gets closer i really want to have a car to learn in properly, i have a big family and need a 5 setter with 5 doors, as i don't like 3 doors, they are awkward, i am only 5.1 so need a car i can see the over the wheel on, im not sure about buying a car from others about rather buy one from a second hand car shop, but im not sure what would be best for my first car, can anyone help me in finding the right car that is cheap enough that i wouldn't lose well my christmas and birthday money until im 25. no higher than �2500. thank you.