work with other creative people as much as possible.
the one big mistake is to try to do everything by yourself every time, writer-director-cinematographer-sound designer-editor-actor-producers will have very hard time to adapt later to the professional world where one makes collaborative art for real customers instead of self funded diy shoestring stuff which is made purely for fun.
It is good to know what the other departments are doing and in small budget stuff you need to wear multiple hats quite often but you need to also learn how to work with a crew and how to collaborate with other creative people to do bigger and more complicated projects which are impossible to do with a one-man-band.
Do you know any other film-oriented people near you? you could start a filmmaking group and start to do projects: first some small test 1min shorts for example and later some more complicated stuff.
Watch both good and bad movies, you'll learn from both. making of documents may be helpful but they are often very glamourised and won't show the filmmaking techniques clearly. Workshop videos may be very helpful, much more so than average making of stuff.
If you happen to personally know anybody who is working in movie industry it will be most helpful. A personal mentor would be the best you could have for your career and could probably get you some intern work later on or at least arrange set visits so you could see how the professionals really work (as said, the making of stuff does not normally show it clearly, you really need to be there to understand why they are doing the decisions they do)