Moved from Airline and RPT Rumours & News in Australia, enZed and the Pacific. Read the forum headings for the correct forum before you post.
Your questions are not aviation related and you need advice from a qualified migration consultant. Whilst a sub Class 600 Tourist/Visitors Visa permits some limited study, the principal purpose for your travel must be for tourism. You do not qualify for a Visitors Visa if your sole purpose of travel is study and obtaining a qualification. You have a high chance of being turned around at the arrival airport, sent back and become a prohibited arrival for three years.
I'm not an expert but I suspect you may need to find a flight school with CRICOS approval and possibly a Student Visa??