Before you start working as a film composer there are a lot of things you will need to learn and study. Like harmony, composition, orchestration, mastering and composing for screen. This is one of the few careers in the film industry where you really need to study in college before you start working from it. So apply to a school that offers a film scoring major if possible, if not, you can get a degree in composition and then do a film scoring course, this should be possible in any country. The main things you’ll need to learn are: how to compose, how to compose for orchestra and how to make different types of music. But you don’t need to be exceptional at these to be successful in the film industry. Actually the most important thing you need is to create an original and unique style. In the industry, this seems to be more valued than being a great composer.