As film becomes obsolete, more professionals are turning to digital recordings using computer hard drives for moving pictures. Some cameras can be rented that use real film though. The cinematic standard for years has been 35mm for both motion picture and still cameras. Still cameras use larger film formats for very high definition photos.
An 8mm or 16mm film camera is considered acceptable for amateur use and projection on small screens where the grain of the film is not distracting. Photographic film has chemical layers that are sensitive to light and each layer is made of tiny grains of the chemical. This affects the image when magnified onto a large screen or print.
Digital cameras also have "grain" in the form of pixels. With a cheap camera you can see the pixels, which makes the image fuzzy. A modern Nikon SLR digital camera can actually take a clearer picture than a Nikon SLR film camera using 100 speed 35mm film. Less "grain" in the digital picture.
For motion pictures the best quality image will be from a 35mm film as the image can be projected on a theatre-size screen and remain clear. An 8mm image will be too grainy on that size screen, but acceptable on a 4X5 foot screen.
Using 35 mm film is a bit expensive for a beginner. To experiment try the cheaper 8mm, if you can find it, you may have to special order it.
What you get from using a film camera is an understanding of the relationships between shutter speed, aperture, depth-of-field, focus, stop-action and lighting. Things which the user of most digital cameras will never learn or care about because they are not photographers. You should learn how to do it manually, so you will know when to override the automatics built into a professional grade digital manually and have real control of the image, instead of a snapshot done by a computer. In a digital SLR camera, the digital part should only replace the film, not the photographer.
Film is going the way of vinyl records for music. Where would you get new vinyl records today?