Ask questions. No one likes talking about anything more than they like talking about themselves. Keep it light–ask about his hobbies, favorite band, favorite trip he’s ever taken. If he’s polite and smart, he’ll be stoked to hear whatever stories you share, too.
Just avoid gossip (you don’t want to appear catty) and never ever bring up your exes on a first date–otherwise it’ll feel like your old flames are there on the date with you. And that’s lame!
A good way to keep it from feeling like an interview? Sit side by side instead of across from one another. It’s romantic and takes off the pressure that a lot of awkward first dates present!