I wear makeup regularly (I am a lady). "Light" makeup usually means natural-looking and easy to apply. The highest-yield stuff would be something to make your skin look smooth and even (foundation, tinted moisturizer or BB creme), something to make your lips pretty (gloss looks natural and is easy to apply although lipstick is longer-lasting and less sticky), and maybe a little eye makeup (this is easier to screw up but not really that hard; start with drugstore mascara and eyeliner pencil and consult Youtube if you want to take it any further). I'm happy to recommend specific products but a lot depends on your complexion.

Edit: Forgot to mention, if you have acne at all, spend money on a good concealer that matches you skin, Dermablend is the shit, this is probably worth it for gents as well as ladies