Here is my advice, if what looks like a NM vinyl to you under a bright light (no hairline scratches of any kind) but it doesn't have a shiny gloss, it has been overplaid and needs to be graded VG+. Selling your records to a record store will get you a dollar or two per record at best. Sad.
As far as the newbies in vinyl, I agree that streaming will be the much easier road. I started collecting vinyl in the 60s so I have a lot of valuable analog records. Anything after 1981, I buy CDs since things went mainly digital then. You would have to spend a lot of money to get vinyl either as used original or new analog releases. Not to mention the much higher cost of equipment for vinyl over CDs or streaming to better them. I do all 3 because I have been at it a loooong time. I can't recommend vinyl to newbies.