First Car.

Ok, Im looking to buy my first car soon, although im only 15, I want a little side project to work on
. Im really fancying an eg hatch at the moment. However, it will need to be a small engine capacity, due to insurance costs. Im going to an auction soon to see what I can find, does anyone have advice on what to look for. (I mean briefly, engine, mileage etc).
And do you reckon it would make a good first car?

And do you reckon it would make a good first car?