Most Helpful Girl
Foundation is not necessary, if you want to get some you can. I usually just wear mascara. It looks natural and nice, and plays up your eyes.
I would say some basics to have (and I am speaking from someone who doesn't wear too much, just enough to look nice) are:
Eyeliner (liquid or pencil, it's up to you)
An assortment or eye shadow colors for special ocasions. (I got one of these for like 10 bucks on sale. And it has 20 colors).
A lip stick or lip gloss
Whatever else you get is up to you. That is really all you need for the absolute basics.
For the eye shadow, pick one that compliments your eye color. So if you have blue eyes, get brown. If you have green eyes, you can get purple or brown. With brown eyes get blue, and so on. Ask the cosmetician for help if you aren't sure.
I would also get a primer for your eye makeup, especially if you are going to be out somewhere warm like a club. The primer just makes sure the makeup stays in place and doesn't smudge or crease.