Where to start and go from here after partners sudden diagnosis

Hey all, things have been a bit of a whirl wind. At this point I'm not even well versed in all the lingo, as it happened so quick. I did just get the book, Dr. Walsh's Guide to Surviving Prostate Cancer, but only just yesterday. About a month ago my partner, 65, got his PSA back and it was a 25 previously it was below a two. His last PSA was about 17 months prior. He went to urologist to digital exam and then we were told we needed a biopsy ASAP and that we should read up on the NCCN Advanced State Prostate cancer. This was on a Friday and they scheduled a transrectal biopsy for Monday. It came back as a Gleason 4+4, and group 4. Then he has the MRI the following Monday and PET scan that Friday, which was today. His results were sent to his portal, and it is showing that it has metastasized to his lymph nodes and parts of his spine, hip, and ribs. So, I guess since we haven't even heard from the doctor yet, I did the horrible thing of looking on the internet, and of course that was probably not the best thing. I just wanted to reach out on here to get more info or hope, or a dose of reality... I just feel really lost.