The 50mm lens is a beauty. Back in the day a standard prime was the norm and f1.8 is light years ahead of the zooms of that era and better than most now. Get a manual plug in adaptor and you are set. For cheap additional lenses, look out for these that slip under the radar. Vivitar 28mm f2.8 and 135 f2.8, both made by Komine with serial numbers beginning 28####. They are top quality fast prime lenses that can be had for bargain prices. The only other thing to look out for is the door seals. They may need replacing and it can be done at home with a kit. Best ones from Jon Goodman.
Good luck with your new to you camera. John.