Before you think of getting into the movie business, do yourself a favour and read William Goldman's Adventures in the Screen Trade. Although it was written in the early 1980s, it rings true about what is generally known about the industry today.
It's split into three parts. The first part describes the industry in terms of its key players and elements. Stars "live in a world in which no one disagrees with them, agents "are not noted for human kindness, but above all, "not one person in the entire motion picture field knows for a certainty what's going to work". Part two explains the process of making a movie using examples from Goldman's own career. Some of his notable films include Butch Cassidy and the Sundance Kid, Marathon Man, and A Bridge Too Far. The final, third part takes the reader through the process of creating a screenplay from a short story, and includes five interviews, including with a cinematographer and a composer, who explain how they would help turn it into a finished product.
The writing style is conversational, with lots of Americanisms. Women are few and far between in this exposé; a few stars, the writer wife of one of the journalists involved in All the President's Men, and an editor. By the end of the book you'll understand how the whole Harvey Weinstein scandal could have come about.