A lot of money (six figures). That's why most jet pilots are ex-military pilots. The military pays for their training.
The CPL - I/R and ME will be around A$75,000 -
You are now 14 of age - by the time you complete education it will be 100,000 -
For that you qualify to fly lightplanes commercially - i.e. banner towing, air taxi -
That is just the first step -
To be flying a 747 - much more money and many years of experience -
Such as jet experience and getting the ATPL -