Use past posts to get a short list of cars you want to look at, my personal recommendation is a Yaris (but I'm biased).
Look at getting a small engine, 1-1.2L, as a new driver you want to build your confidence, a larger engine can leave you feeling that its driving you.
Look for a car with non body coloured bumpers, they are more forgiving of minor 'mishaps', check out the driving postion in the car, how much visibility do you have in front, behind, out side windows when turning... Is the postion comfortable, you may end up spending hours there, so comfort is a necessity, play around with the seat setting, higher, forward, change the wheel setting (if the car has that option), check where the spare is (fiestas at 1 stage kept them under the car so you had to open the boot and undo a bolt to get the wheel down, not user friendly on wet roads...).
Put a shortlist together, ie Micra / fiesta / yaris, and test drive them from a garage, you're not buying on this trip, but use it to guage prices, warranty options and do you actually like driving the car. If necessary bring a friend whose sole responsibility is to ensure you don't buy anything... also use friends own experiences with cars, good ones / bad ones.
Good luck to you.