I'm sorry you got the news you didn't want to have. As all have said, the next step is the find out all you can and make a decision you feel most mcomfortable with.
A second opinion is easy to get. You can have your slides sent to another lab for another reading. You can also just take the pathology report to another surgeon and/or radiologist for a second opinion and advice.
You do have some time as well. For example, when I went for a second opinion (mine was early stage as well) the second doctor, who was a friend as well, said "Barry, just do something (surgery or radiation) this year, please." At the time, that was six months to decide, so you don't have to rush. I made my decision in less than one month, but that is up to you.
A good doctor won't push you either way on surgery vs. radiation.
It is a blessing you have caught this in what appears to be a VERY early stage!
Also, Rick, my doctor gave me a nice book with 100 questions and answers regarding prostate cancer. It is very well done. I would be glad to send the book to you (or someone else) free of charge. Contact me at my e-mail address using the icon at the left. I'll give Rick first dibs.
Please keep asking all the questions you can as you work through the initial fear.
Don't worry, the fear is normal, you are not a wimp! We all went through it and often go through it again as we await our regular PSA results (my 4th PSA result is due next Tuesday! )
Our thoughts and prayers are with you as you make this important decision.