If you are thinking about not attending the Australian school just because it is too far, think again. You are being offered scholarship, which is an A+ fact to consider. Leaving home and studying at a foreign place has its own benefits. You learn the culture, know people, the food is great, and so on. You will also have the time to do new things other than what you usually do at your home town/country. You are going to be gone for a limited number of years only. You can relocate as soon as you finish anyway. Go for it!
I'm an international student in the US, and I've been away from home for about 5 years now. To get to home, I have to travel half the circumference of earth... literally!! It can get quite nostalgic at times, but leaving home to come and study here is probably one of the best decisions I have made in my life. I hope you will make a sound decision as well. Congratulations on the offer!