Please don't be that guy... You know the dude who brings his girl to the range and provides no instruction what so ever on how to hold a rifle or a handgun. I'll give you a little pro tip: bring something with low recoil. Your lady's first shooting experience shouldn't be with those custom hand loaded .44s that are designed to take down a 300 pound wild boar. Bring a 9mm or a .22 and if you are going shotgun (bad choice for the ladies) try to start her with birdshot.
About every six months or so, someone puts together a nice shooting fail compliation. This one isn't bad and has lots of dudes that filmed their chicks damn near dropping weapons. Lol, there are a number of dudes who fail in this vid too, and I particularly enjoyed the dude doing the one handed shotgun and the thumbs up afterwards.