Start-ups ideas and tips for an 18-years old overseas student?

Hi guys, thanks for viewing this thread first of all. I need some tips and helps for ideas that can propel me into the business world, even though i am an overseas student ( non-PR ). I was sent to Melbourne, Australia, about a year ago and would love to start working preferably home business rather than at McDonald’s. I have a reasonably start-up capital in the bank provided by my dad which he allowed me to use for a biz reason, not on cars.

On top of that, we are also planning to buy a property in Australia to live in, which i have the capital already to do so. Just wondering, should i jump into the property market, buying then renting, or shares? In my consideration, website marketing has a good prospect and have lesser hassles, and i tried to start an eBay business as well.

Now, how should i finance and start the vast ambitions that i held for years? i wish to be like sir Richard Branson one day, and his prolific start-up at 16 ( Student Magazine ).

Thanks in advanc