I'm sorry for your news. You really do need to take it one step at a time.
After your biopsy results, and I guess some scans. Your specialist will decide the types of treatment you will need. Surgery can be before Chemo or After, ie if Chemo is needed.
Things will probably move very fast from now.
I always like to mention for new ladies, you may like to claim Income Protection Insurance, if you have it.
Whether or not you want to try to work or not, will depend on the type of work that you do. And how flexible that may be.
If you are working and have a superannuation account, you may have IP included in it.
There is often a waiting period, so put a claim in as early as you can. That is if you want time off.
I had Mastectomy with Axillary Clearance, Chemo 20 weeks, and Radiotherapy 5 weeks.
From start to finish that took 9 months. I also had a couple more months to recover.
You may not need all of that. Just putting it out there.
You will get plenty more advice here as you go forward.
Find out what you need first.
Take some one with you if possible, for a second pair of ears.
Write down any questions as you think of them.
All the best with any news and treatment. Thinking of you.