you didn't say where you were going.. in any case, since it's a day date, the clothes and makeup should be slightly above casual, no more.
Makeup -
Face - wear foundation that's the closest to your skin tone. No powder (unless you have really oily skin, in which case, get an oil free foundation).
Eyes - plenty of mascara. no eyeliner, no eyeshadow. (you can add a dab of shimmer under the outer tip of the eyebrow but no more). Make sure your eyebrows are combed. Add concealer under the eyes only if you really need it.
Cheeks - Put very very little shimmering blush on the apples of your cheeks. If you can see the powder sitting on your skin wipe some of it off, it has to look natural.
The best one out there for me is
http://www.s2buy.com/Neutrogena-Mineral-Sheers-Blush-Powder-Blush-ILLuminator-05.html
In any case only use coral or very light pink color on your cheek at day light. NEVER red, orange, pink or brown.
Lips - nude/coral lipstic or sheer lipgloss. Don't accentuates the lips too much. It looks great for a party, but on a date you want to concentrate the focus to your eyes.
Wear something form fitting but comfortable. Not too tight or showing (no more than 1 inch of cleavage).
Wear a light perfume, not too dominant, some people have allergies.
Have fun :)