Congrats on your new P7. It is a standard P7 and not a P7M8.
Your P7 looks to be a former German police issued pistol. The markings on the right side of the slide are your serial number, date of manufacture, and proof that it was issued to the German Police. There are a number of threads on this site that go in to much greater detail on those markings.
For refinishing options, I would start with this thread: https://www.hkpro.com/forum/hk-handgu...es-thread.html. The holster wear doesn't look that bad. You may just want to leave the finish as it is.