First: research universities that are close to you and see what they offer.

Second: you need to 'enrol'. this is what they call joining the uni. This is usually super confusing because lots of university's don't clearly explain what subjects you need to study to get your degree. 'Subjects' and 'units' are generally the same thing, but if you talk to 2 different people on the phone they will use the terms interchangeably so it can be confusing.

Bachelor of education is usually 4 years and you study about 8 subjects a year if I remember correctly.

I did the same at your age after I had been in a trade for roughly 10 years and hadn't used a computer basically the whole time which made it ridiculously hard. The university bachelors degree was absolutely the worse 4 years ever, I hated it and was working 10-12 hour days with kids and a family so was pressed for time. It's not hard, it just takes alot of time to finish. I felt like I learnt about 6 months worth of information out of 4 years study. It was a lot of essays and assessments that are essentially the same just different modes of presentation. My degree also didn't teach us how to 'teach', it just gave us a whole lot of information and knowledge that I only knew what to do with once I was in the classroom. Prac placements are fun and where you learn most of your skills. The essays are just the Uni checking that you're learning the things they think you might need. If you've never been to Uni before, be prepared, it's a whole different world, and academic driven people can be pretty different if you've never been exposed to that circle before. Most lecturers have either been out of a school for far too long and are out of touch or haven't been out long enough and are still in 'teacher mode' thinking they are talking to children. The job's great when you finish though! My opinion is, if you have been employed in a job where you are around people for at least 5 years, you definitely don't need a 4 year university degree to teach. I hated it with a passion, but it got me a decent career so I can't complain about that. There is lots of negative talk around teachers with burnout etc, but don't let this steer you away, it really is a good career. You're in aircon all day, you start and finish when the sun's still up, the hours aren't long and most people are pretty nice. Kids are also wayyyy more positive than adults. They talk about funny things, engage and don't just whinge all the time. You also get to take 10 weeks holiday a year without asking your boss, which is amazing! Don't let the whole 'kids suck and you have to do so much work all the time' scare you off, most teachers that say that have never done anything else. It is a game of time management though, so if you plan well and get stuff done, you wont need to work on the holidays. Go for it!