Daria,
Just 'lil reality check.
Australia doesn't want any more pilots without any qualifications and experience in jobs they consider eligible for skilled migration.
If you want, you can go on Working Holiday Visa, 1 year work permit for 'youth' until 30 incl, after you turn 18. IF you work in some agriculture job, you can renew it for another year (min 3mth of work first year).
Other than that, you ain't got chance without job in demand. Very unlikely to get sponsored as just a pilot (you'd need some special skills not available in local labour market)
As for instructing, Australian CASA requires more experience than UK or US to instruct. Ie gap between doing CPL and being able to instruct.
All this info is available, guess where? On the internet. Check out CASA, Australian schools with their min reqs for FI ratings or vacancies, check out wikipedia and so on. Not to mention PPRuNe as mentioned already.
It's nice to have ideas or plans, but things aren't always so simple.
check out
Department of Immigration and Citizenship for Occupations in demand, if you don't have '60 point' job or 50 with job offer and in regional Australia, you're not too likely to qualify.