Hi!

12 months is quite long. For me I would probably relax for the first few weeks. Have fun and have vacation. And then I will find a job or a program that would probably help you on the field you are interested in. Do some research or do volunteering work. I think it will help to prep you up. There are a lot of websites to prep you up (eg: www.gradaustralia.com.au), give you advices and find you a graduate job you might be interested in.