Hi, you need to contact Education Queensland for the enrollment.
please visit the following pages: http://www.eqi.com.au/programs/tourist-visa.html
The fee is based on the visa type of the student.
For tourist visa, the stuent can attend the school for up to 12 weeks and the fee is $262.50 per week.
For student visa, the fee is $10500 per year.
Known a Visiting Scholar with his wife and 10 years daughter landed in Adelaide from China 11 months ago. As the whole family is on a 1-year visa (whatever the type), the 2 primary schools (she had changed the school after the first 2 months) treated the girl as 'local resident', so (almost) no school fee + free school bus (as the 2nd school is a bit far).
The girl had only attended 10-months school, and flown back to China before the term's ending, to continue her Chinese school at home city.