Hang in there! You, thus far, have described prostate cancer caught in it's early stages. My Gleason was 3+3=6 as well. Let's see what the second opinion from the Mayo Clinic says.
As far as treatment options, there are many that you can discuss with your doctor. You'll likely need some more information from the second opinion on the biopsy results before you decide.
At 50 years of age, some doctors still believe the gold standard is radical prostatectomy in hopes that they can remove all of the cancer, although radiologists can offer other treatments which they may feel very good about. Fortunately there are many techniques that have skilled health care professionals behind them and good track records.
It is important to be informed such that you can make the right decision for you and your husband. Our moderator has provide a topic at the top of this discussion group with links to helpful information. You may also try my web site (listed below) that has these links and some more. Your doctors will want you to decide on the treatment that is best for you and that you feel the most comfortable with.
Critically important is taking time in between study to think and ponder. You don't need to rush at this point in time, based on what you've stated about the biopsy.
The good people in this forum will be with you throughout your journey.
You and your husband are in our thoughts and prayers.
All the best,