Ohhhhh fully manual camera (Mamiya Sekor), very nice to hear! That will be an excellent camera to learn on! You set the ISO (same as ASA) manually based on your film (note DIN or the Deutsche system is phased out and we genenlly don't talk in DIN scale anymore), adjust aperture and shutter speed based on light meter reading (hope your light meter is still working) and you are set! That sounds like an outstanding camera! Your other sounds like a great kit too but learning on a fixed lens (non-zoom) is often very nice so you can focus on composition and your body position to zoom, the most pure analog, IMO. Happy holidays to you too, you will have a ball shooting film!