Wow. That is a big question. The process starts by becoming informed. It is important to remember that prostate cancer is a very diverse disease, ie not everyone's cancer is the same. Also, we are all individuals, and the type of treatment can vary because of this too. There is no "one size fits all".
It starts by finding out the type of prostate cancer you have and what stage it is at. Your urologist will give you this information. There is then some excellent reading material put out by the Prostate Cancer Foundation of Australia (PCFA) and the Cancer Council.
Some prostate cancers can be watched/observed. Others need to be treated. If you need treatment, then there are almost always options, ie surgery or radiotherapy. It is often useful to speak to the different types of doctors and get their opinions on the suitability of their treatment option for YOUR specific cancer, and YOU. It can also help to visit this site and talk to men who have gone through the process and treatment and canvass their views
Dr Nader Awad