Hey geminii

So I want to preface this by saying your school will most likely be running info sessions/tutorials on this sort of stuff closer to the date of applications opening, so I wouldn't stress too much. Even once preferences open, you have ages to do them, so definitely don't be worrying about it now

If your school doesn't explicitly run sessions, I'd suggest sitting down with your careers advisor or maybe your year 12 coordinator when applications open if you want someone to walk you through all the processes

From what I remember of the process, you have to make a new account - it's not the stuff you used to access your results last year. You have to add in details about you and your studies, etc. and then once that's done, you can add preferences - it's simply a matter of searching a course in the search bar and adding it to your list! Overall, it's a reasonably uncomplicated process, and there's plenty of info on the VTAC website to help you out.
All the best!