Oh you have a lot to take in and you are racing ahead in your thoughts but you need to go to your next appointment, take someone with you if you can as a second set of ears, and take in as much information as possible. They will also explain what they believe is the best course of action and where you may have that treatment. Public or private?
As noted earlier it is the Oncologist who will determine treatment regarding chemo, radio or zoladex!
We are all diagnosed with Breast Cancer but it is very individual, not only type and stage but our age and if we are menopausal and so it goes!
https://www.bcna.org.au/understanding-breast-cancer/what-is-breast-cancer/This link will be of help to you learn a little more and there's a link within that takes you to a different page for you to read up on your type of Breast Cancer - you didn't mention it above!
Take care, best wishes and take a deep breath