Gosh .... you sure have a lot on your plate just now, @NotHappyJan - and sorry to see you here on the forum with your diagnosis.
The Journey kit may help you in information as well as keeping all your info/bills/appointments together:
https://www.bcna.org.au/understanding-breast-cancer/my-journey-kit/ ;
The ladies here will give you a heap of tips & advice ...... BCNA has a HEAP of info here that may help you in telling your family & friends about it:
https://www.bcna.org.au/understanding-breast-cancer/talking-to-family-and-friends/Remember - you don't have to tell EVERYBODY ...... but as you will be having surgery soon, you WILL have to tell some of them - especially the company offering you the job. If they really want you for the job - I am sure they will wait for you. It is just one extra stress that you don't want at this point in time.
Have you had a biopsy & 'know the cancer type' and where it is?
You should try & get a trusted friend or family member to attend your surgeon's appointment with you - as an extra set of ears & also for support. I'd recommend you ask if you can record the meeting, for future reference.
One day at a time, deep breaths .... believe in your medical team. Ask about going as a public patient (even if you have full private cover) as there MAY be significant out of pocket expenses. ASK about the gaps!!
All the best - I'll be thinking of you - try not to google stuff too much as it may do your head in. Everybody's case is different from everybody else's ...... try not to overthink it all. xx