The most important thing is to let your natural beauty come through. I know you have prob heard this a million times, but its true. Guys dont like to look at a girl caked in makeup.
For makeup- Thin line of brown eyeliner; mascara; a light shimmery eyeshadow just on the lids (optional). Stay away from heavy foundation, and bright lipstick.
For Hair- This really depends on your length and texture. try to bring out your natural hair. If its curly, define the curls with a mousse, and defrizzer. If its straight, try adding volume with a volumizing spray.
Final tips- Stay confident, and smile alot. This really does work.