1. dont overdress, especially if the venue doesn't require so. 2. keep your body language open, but not too open. 3. don't talk about yourself too much. ask him things about himself too so he knows ur interested. 4. take mints... just in case :P 5. remember to smile often and have fun. 6. be yourself. unapologetically.
Just be yourself and enjoy the idea of going there :D And: always do it in a public place (bar, restaurant, bowling, movie theatre,...) just in case he's a creep. But those stories are rare so don't worry, just be careful!
Good hygiene, wear something nice but don't overdo it since he'll most likely be casual at your age. Don't invite him in your house/apartment on the first date unless your looking for more than a good night kiss.
I would talk about things that you both have in common. I would ask him what he likes to do for fun, and ask him what he has been up to, school? Job? Travel? Be truly interested in him and make sure to smile a lot, and I encourage you to try to make him laugh too. Good luck and go easy with the make up if you wear any.
Wear your favorite outfit. (It'll help you feel confident) do your nails (it shows you care) don't put any pressure on yourself and Do something fun that promotes interaction but refrain from having sex.