First thing you should say... "It's nice to finally meet you in person. Would you like to grab some coffee?" Yea you may have been "dating" long distance for awhile now but this is the first time you two will be in each other's presence. You're going to make another first impression. Make it count. Dress nicely and be polite. Make sure you're cleaned up, smell good, brush your teeth, and all that jazz. There's a whole new added pressure to meeting someone face to face. Effectively, pretend you're meeting this girl for the first time ever. Treat it as such.