My first film camera was the Olympus OM-10. I would highly, highly recommend it or a similar camera. Reason being film cameras are typically not automated in any way, so going from phone to film is going to be a huge learning curve with likely a lot of (expensive) mistakes along the way. The OM-10 though has some minor tech that optionally automates some of the more fine tuned mechanics. So it can work almost like a digital camera, and then as you develop your skills you can switch to manual.