Updated: Jul 23, 2019
Start early, start young.
Steven Spielberg made his first movie when he was 12. A partial history is found here: Wikipedia contributors. Steven Spielberg. Wikipedia, The Free Encyclopedia. July 16, 2019, 17:11 UTC. Available at: https://en.wikipedia.org/w/index.php?title=Steven_Spielberg&oldid=906560824. Accessed July 22, 2019. Study some of his filmmaking techniques here:
Then there is the Coen Brothers. Their first film was created when Joel was 11. Much of their story can be read here: Wikipedia contributors. Coen brothers. Wikipedia, The Free Encyclopedia. July 11, 2019, 02:14 UTC. Available at: https://en.wikipedia.org/w/index.php?title=Coen. Accessed July 22, 2019. Study some of their filmmaking techniques here:
by Alyssa Maio July 22, 2019. Available at https://www.studiobinder.com/blog/best-coen-brothers-movies-ranked/?utm_campaign=Weekly_Newsletter&utm_medium=email&utm_source=sendgrid&utm_term=coen-brothers&utm_content=coen-brothers#fargo. Accessed July 22, 2019.
Don't wait. Use your cell phone and free editing software. Start next weekend. Nothing like on-the-job training.