If you are younger than 31 and an Australian, or NewZealand or Irish citizen, you can get a Working Vacation Visa, allowing to live and work in Canada for two years.There is even a way for you to extend that long enough that you can apply for a Permanent Residence visa.If not, start here: Do you want to come to Canada, or extend your stay?
To work as a Real Estate Agent in Canada, you will have to take a university course and pass a number of exams.That will take from one to two years.
It won’t help you to start a company in Australia.You will have to go through all of the licensing procedures that exist in Canada to be a real estate agent in Canada.Since you are currently in high school, you would probably be better off to immigrate to Canada first and work on your real estate license once you are in Canada.
Alternatively, you could become a real estate agent in Australia and gain experience,there first.If you later immigrate to Canada, your experience will help, but you will still need to jump through the licensing hoops in Canada.All real estates agents have access to the Multiple Listing Service (for a fee), so you wouldn’t have to developed a database from scratch.
I believe you have to take a course here, probably the same duration as the one you took back home.Please remember, there are over 12,000 people holding a real estate license in the Great Vancouver area today.