Unfortunately I have never found a 'killer' opener. Havign said that I've found being direct the most effective the handful of times I've done it. Just look online for openers, there'll be loads.

As for the date. Go out with her for a brew and relax as much as you can. Try not to fill you head worrying about body language or what to say. Just ask her stuff that you are interested in and tell her things that are going on in your life. Dates for me are about getting know each other, so being open and honest is where it's at. It doesn't have to be deep or spectacular. Above all trust yourself.