Are you serious? Oh, well.
Unless you have major super-connections that have allowed you a privileged apprenticeship, you need an impressive resume/portfolio for sure, and a related degree in most cases (sometimes just the credentials, but never just the degree).
Learning on the job is mandatory, as is actually practicing cinematography and photography. You have to stay current with your medium. Film school might teach you the basics; a few of them will do that well, while providing access to relevant equipment and opportunities to practice.
Like most art, anyone who does it enough can be good at it. But if you're talking about widely-distributed feature films, not a ton of qualified people even get to do such a project. This may come as a shock to you, but show biz is competitive.
