OK, I've got my profile up on Au Pair World and have seen some au pairs I like the look of who say they're interested. But then: either they don't reply when I email them with further questions or I don't know how to make sure they're not mad, bad or addicted to something when they're living in another country. (naturally being British I don't speak another language fluently enough). Top tips please/past experiences on how pick a good 'un and make the initial contact useful without putting girls off.