Q1. So, I want to study abroad. What are some general issues?

Australia has a range of perfectly good universities, so: 

1. think about your opportunity cost as well as the opportunities which will arise by choosing to study abroad. If you want to come back and work in Australia, you need to be sure that your overseas qualification will provide you with a recognised pathway. 
   
2. think about the cost of living, as well as the total tuition cost in the intended country and the intended institution of study - is this supportable by you and/or your family?
3. think rationally about (a) how competitive you are in terms of your actual ability, and (b) how socially and emotionally ready you will be for living in a country where you might be separated from your normal support structures back in Australia. Many of the institutions you might be thinking about attract applications from the best students in the world. On the other hand, many very bright and capable people falter when they are isolated from the support which has underpinned their success through high school.
4. research thoroughly the range of institutions available, and the standing of their courses, accreditation, teaching, and research. 
5. take good advice from those at Scots who have some knowledge of university life overseas. As well as Mr Young and the pastoral care staff, there are numbers of staff who have been where you want to go (Cambridge, St Andrews, Harvard, and the other great universities). Ask around, and have a long chat over a cup of tea.

If you would like to talk through these issues, why not make a time to talk to your tutor, who will help you think through some of these issues.