To be elegible, you must get a working holiday visa or a student visa.
The Working Holiday programs encourage cultural exchange and closer ties between arrangement countries by allowing young people to have an extended holiday supplemented by short-term employment.
Visa Options
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Working Holiday visa (subclass 417)
For people from Belgium, Canada, Republic of Cyprus, Denmark, Estonia, Finland, France, Germany, Hong Kong, Republic of Ireland, Italy, Japan, Republic of Korea, Malta, Netherlands, Norway, Sweden, Taiwan and United Kingdom.
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Work and Holiday visa (subclass 462)
For applicants from Spain, Chile, Thailand, Turkey and the USA to holiday and work in Australia.
Australia has working holiday arrangements with a number of countries and regions
Age: 21, Nationality: American. I am a very motivated and determined person, when i set my ind to something. In the mean while I am looking to widen my experiences in life and explore what else the world has to offer me. I feel as though my love for children and this great program would be a great opportunity! 
Age: 20, Nationality: French.Dear family,I didn't choose Australia by luck. I think it's a really great country. But I didn't chose this job by luck too !. I really love to spend time with children, of all ages. Take care of them and help them in learning . I would like to be a real help for you.Those are the reasons why i've done my BAFA, and why I spent all my holiday time working with children 
Age: 19, Nationality: German.I would like to travel and get to know other countries and their people.My nature is rather calm and I'm open-minded, but I might be a little shy in the beginning. Reliability, honesty and punctuality go without saying. 
Age: 22, Nationality: Canadian.I would love the chance to be apart of the family and take care of the kids any ages! I am very caring friendly and outgoing I am very close with my family I love them so much and I cannot wait to be apart of your family if I get the chance to.