Gleason 8. High risk. Prostate swelling-cancer is contained for now.

Age: 56.
Physically/mentally: Strong.
Gleason 8 - High Risk.
Stage: IIIa
Cancer tumor: Contained within prostate for now. Tumor protruding outward.
Recommendation: Per radiologists, surgeons, and others relevant to the cancer treatment profession, radiation (40+ treatments) therapy is recommended along with testosterone suppressants (6 months). Surgery is not discounted, rather its said to be more radical with same outcome (cancer killed). However, the chance of cancer return in the future is more probable after radiation, than surgery.
Other: Triple bypass June 2022, 3 stents, prosthetic heart valve installed. 1 heart attack early 2022.

In process of discussing types of radiation treatments with Mayo radiologist.
We've discussed:
1. Markers placed in and around tumor. Radiation injections, either IM or IV. Along with testosterone suppressors.
2. Adding or not adding beam radiation therapy.

This is my first experience with cancer treatment of any type. As for the types to treatments I've mentioned, does anyone have cancer treatment experiences that come from a similar prostate health condition? With same treatment options?

What can I expect?
How will life change during and after treatments?
Should I look at other treatments?
Additional treatments?
Are there specific questions I should ask the radiologist?
Anything you want to add - Advice? Suggestions? Cautions?