How would you go about moving to Uk?

I'm 15 currently, in year Ten. Australian.
I've always wanted to study and live in the UK, but obviously I have a fair while until I can. I'm not even legal yet.
My "dream" is to do my first and possibly second year of University in Melbourne, but then relcocate to the Uk and finish my education there.
Problem is, I don't even know if that's possible lol.

What would this involve? Costs, eligibility, scholarships, age, all of that?

Thank you for any information you could give..
I am just very curious and like planning my future out n_n