My complexion sounds similar to yours. I wear makeup most days, but only spend about 5 mins on it. Everyone has different favorite productions -- for instance, if I could wear only one piece of makeup, it would be mascara (my eyelashes are light, so mascara really makes my eyes look nicer). I think experimenting is the only way to find out what you like, although going to a place like Sephora might be a good way to get to try out different things for free (just beware -- if you ask for a makeover from someone there, they might make you look way more "done up" than you'd like. So give them instructions that you want to still look natural and if you don't like what they do, remember it washes off and you can try again!). One important thing about choosing the right makeup is making sure you use the right colors for your skin tone. Most blonde people tend to look better in cooler colors (unless you're a strawberry blonde), so if you use blush, you'd want to choose a cool pink instead of a coral color, for instance. This is where talking to someone at Sephora or Clinique would be helpful -- they'd be able to help you pick out good colors. But realize that their help is free -- you're not obligated to buy their products, and you can always go find a cheaper version at the drugstore if you wish!
Is there anything about your face you don't like? I have blue circles under my eyes, so the first makeup I ever used was concealer. If you have uneven skin tone, you'll want to try some foundation. If you have very pale skin, you might want to try a bit of blush. If your eyebrows are patchy or very light, a little eyebrow pencil might be nice to fill them in (good eyebrows really seem to make eyes "pop"). These are just a few examples, but remember, you can pick and choose what you like and what you don't care for.
I use a mineral powder foundation all over my face because I find it's far more natural looking than the liquids or the pastes (Bare Minerals is a wonderful, but expensive brand; I now use the Physician's Formula brand that is available at the drugstore). I apply that first, then a bit of concealer under my eyes, then a bit of light eyeshadow, mascara and blush. On a "basic" day, I just do mascara and concealer.
By the way, I use basic drugstore mascara (sometimes Maybelline or sometimes the cheap $2 stuff, I don't even know the brand!) and find that it works just as well as the expensive stuff I've tried. I use Covergirl concealer and like that as well anything else I've tried.