First have a PSE test. If it shows presence of cancer, then a 3T MRI will be the necessary next step. MRI is the gold standard for imaging the prostate for cancerous lesions. It delineates things that ultrasound is not capable of. You'll need the MRI in order to have a fusion biopsy to target the area of your prostate to be sampled. The ultrasound and MRI images are fused together in this procedure to increase the likelihood of hitting the lesion upon biopsy. From there based upon biopsy results which yield a Gleason score and Staging, you'll want to know how aggressive the cancer is and how prevalent it was in the biopsy core samples. Tests such as Decipher Prostate or Oncotype Dx will tell you the aggressiveness. The biopsy report itself should tell you the percentages on the more aggressive cancer seen, be it Gleason 3+4=7 or some more aggressive Gleason score. I'd further recommend that you do a deep dive on learning about prostate cancer. The decision for how to treat will ultimately be yours. It's best to be educated on it. I'd recommend you spend some considerable time at the website pcri.org It is excellent and will give you all of the education you'll most likely need. It's tailored for the layman and I found it of tremendous value in helping me understand what I was dealing with.