(Warning, Spoilers ahead). There is a recommendation about the order to watch the Star Wars movies in, called Machete Order. It comes from a blog post on Absolutely No Machete Juggling, and it arose because of a dissatisfaction with the prequel Star Wars episodes. It attempts to tell a better story, but after viewing it a couple times, it has some problems.
There are plenty of creators (writers, directors, composers, etc) who end up creating work within a existing universe. Think making Star Wars movies, or writing a Star Trek novel. Often the desire for the creator to put their own stamp on the work bumps up against the “rules” and history of the universe. But how should you approach creating something in a universe that already has rules and history?