If you're in the United States, your headlights will undoubtedly be adjusted through the use of four trex-head screws. These are trex-head screws:
Most of the newest cars are designed by engineers who don't want you to adjust your headlamps manually. There are any number of places online which will tell you how to adjust your headlamps based on the new spirit-level systems built-in to most automobiles. Just do a search for "how to adjust my headlights."
If you do decide to to adjust your lights manually, you'll want to find out where the adjusting screws are, and determine if they're trex-head, or some other type of head (not all of them use a trex-head screw). Whatever type they are, they are unlikely to be any standard type of screw head, and you'll pay through the nose to get the kind of screw-driver you need.