1beerplease

Greetings people, i am a 23 year old from Australia wanting to go to uni. I dropped out of school at the end of year 10 and started my apprenticeship. I have been reading online a lot about the process and requirements for going to uni and it confuses me. For starters the subjects that i read alot about at home and the ones i would want to study are Physics, biology and chemistry. I dont know where to start to begin this process, i understand i will need some higher education to be excepted into a university. I was thinking tafe, than i read somewhere about open universities and doing online courses. What type of courses would be best suited? I am lost as where to start pre uni education and what courses to take, and what process will be after that. Thank you.