Hi! Being an au pair, nice idea! But weren't you finished with your studies? You could always try and find a job in that area in New Zealand or Australia and get valuable work experience while exploring the world? :) (ok, might be easier said than done, but it's worth a shot)
I already thought about this, really.
I’d love to work as a nurse in New Zealand, it would be a very great experience. But it’s very expensive. First I’d have to register into a international registration, and you have to pay for it (something like 600€). And you have to do a English Language Assessment (and pay for it as well). And, next to that, you’ll have to find a place to live in, etc. It worth it but it’d take ages to have all of the money for it (and you have to wait something like 1 year to be registrated).
It would be interesting but very complicated to make it so, sadly.