Watch out: your host family doesn’t have to pay you your pocket money in advance when you first arrive. Most host families usually don’t do that. So make sure you have some extra money for your first days and weeks as an au pair.
If you are from Germany and want to work abroad as an au pair, you might still receive your money from the The Department for Child and Family Services (Familienkasse). In order to receive the payments you need a certificate from your language institute that states that you take language classes on a regular basis, for at least 10 hours per week.