To decide which Au Pair is right for you family is not that easy. As most of families need an Au Pair to look after there children it is very important to be the right candidate.
A lot of families would like a caring Au Pair with a good level of English and probably good driving skills. But "good" can have different degrees for each of us. After you have make you decisions about which Au Pair profile matches your criteria start email her/him. If he/she is happy to join your family then do not stop here, PHONE him/her to find out more details and make sure they have the level of speaking English that you are happy to start with. Of course make sure that you are talking to your future Au Pair and not to a friend or relative with good English skills. This is a very common mistake and very frustrating to get somebody that can't communicate with you and your children.