New and Need Guidance: What questions to ask about prostate cancer?

Hello everyone, sadly I have had to join this area of the internet which we don't wish on anybody.

I am on here because my father who is 70 had a blood work done on 1/23 with a PSA of 26 and another blood work on 2/23 with PSA 20.

We are in Michigan, USA fyi.

Completed a 3T MRI on 2/23 and today got the results showing a Pi-RADS 4 with a lession found to be the size of 8mm. The doctor also mentioned that the MRI could also see the close by lymph nodes which looked good.

The doctor ordered a Fusion Biopsy, which they will call us in the next 2 weeks to schedule a date for.

We were all caught off guard and uneducated in the matter leading to no real questions asked and following whatever the doctor says to do.

I wanted to join the forum and ask this kind group of individuals for guidance through this process.
-What questions to ask the doctor?
-What specific types of biopsies are most accurate and useful?
-Is the "Fusion Biopsy" that the doctor ordered the proper one?
-Is there other types of biopsies that we should ask for?
-Is doing a biopsy risky in any way, and can it worsen a situation?
-Is there ANY reason to avoid doing a biopsy?
-In case of bad biopsy results, what treatment options are there? (I would assume you're going to say that this completely varies until a pathology report)
-What hospitals/clinics/locations would be best to go to for the best treatment?
-Is a biopsy very likely to show cancer with a Pi-RADS 4 and lession of 8mm?
-What words of encouragement would you have for myself/my family/my father in this situation?
-Is this something to be absolutely worried sick over?
-Is this something where life goes on with manageable treatments and major or minor life altering events?
-Is this something that we should not worry too much about at all?

IF I am asking ANY dumb questions, please forgive me for my ignorance and uneducated questions. This is obviously a world that nobody wants to go into but unfortunately a lot of us are in.

Current treatment location is at:
Michigan Institute of Urology
St. Clair Shores, Michigan