The best advice is to write a list of all your queries and take that when you see the surgeon. If it is a man, ask him what he would want for his wife/partner as that often opens the conversation more.
Ask what additional treatments may be required for each option.
Ask if these treatments affect reconstruction options.
Have you thought about the type of reconstruction you would prefer if you go for the mastectomy ?
I had a mastectomy as I was given no other options. In hindsight I am glad I did not have to spend a long time with additional treatments however I wish I'd known I could ask them to chop both breasts off.
Putting your thoughts on paper will help you to make the right decision/s for YOU with no later regrets.
All the best as you begin the road ahead, whatever the landscape.