Most Helpful Girl
Don't make it feel like an interview. Keep the date short over a few drinks and less than an hour if you aren't hitting it off, under 2 of you are.
Try to get a sense of their personality and lifestyle but don't focus on work or drill down questions. Basically if you get a good 'vibe' see them again and save that stuff for later. It is just the first face to face but you get a lot from a short conversation.
Most Helpful Guy
Keep it simple on first dates. I usually make a lot of small talk, to break the ice.