I'm sorry for your diagnosis, but you're right to ask all the questions.
Here are some things that may help -
Is surgery the only option they've mentioned? What about radiation? Have they mentioned your PSA level, your Gleason score?
You can read more about those here - https://www.cancer.gov/publications/patient-education/prostate-cancer-treatment-choices.pdf
There are side effects to everything. The booklet I linked above lists those.
I found these on the DaVinci -
If they're even mentioning the watching and waiting approach, you have some time to make this decision. Don't rush it. And I've given you a lot of info, take your time to read it all. Only you can decide the best option for you, your health, and your life/lifestyle.
It's so good that it was caught early, because you do have options. Let us know how you are, and what you decide. Best wishes to you. :)