You are already beautiful :) With a little makeup you can enhance your beauty!
Face: Go for powder and concealer or just some tinted moisturizer. Get some peachy or soft pink blush.
Eyes: I think for someone who doesn't want to wear much makeup that the majority of the makeup shouldn't be for the eyes. Get black or brown eye liner and wear it on your upper lashes. If you want, apply some on your waterline. Too many girls make the mistake of putting too much black eye liner on their lower lashes. As for eye shadows, neutrals are best. If you want, skip eye shadow all together. I think that the mac paint pots are nice when I want to wear minimal makeup. Lastly, the most important step, in my opinion, is mascara! Loreal telescopic mascara is amazing and is very inexpensive.
Lips: Depends on what your style is like. Go for a baby pink gloss, I think. :)
My favorite makeup items are lip gloss and blush and will leave the door in just those and a little mascara.