My next apartment will have in-unit laundry and security entrances.
Maybe not absolutely necessary, but I've been in enough apartments now to know what I want for sure.
It's really a simple thing though, living on one's own. Bed shaker, door light, maybe giving someone you trust a key to your place. (Careful though, sometimes they'll want to drop in anytime, so make your rules clear.)
I'd suggest figuring out where you'll go to college or go to work. Maybe trying to find a place near work/school, and grocery store, shopping, bus lines, and other services you'll use. As well as located in a safe neighborhood.
Great locations like this will likely cost more, but if it cuts down on your driving, it might save money in gas/car ownership, etc.
Lots of ways to go about it. Don't worry about picking the perfect place to start with, because chances are you'll move several more times as you figure out what you like and don't like about apartments.