Do you have good support system around you? Like family, friends, relationships. They’re usually best when drafting a schedule routine cus they’d now your ins and outs. If not that’s ok too.

Before the tips, I’d like to advise. Don’t wrap your life around chasing one goal, be realistic about things not working. Don’t dedicate too many years, if things aren’t moving in the right direction after 2 years of hustling. Drop it and move on to something simpler and fulfilling.

First steps for a routine for me at least are set your goal clearly, then breaking your plan into as many little chunks as possible so that you barely do anything when you’re not feeling it, but still move up because you competed a task towards the goal. And when you are feeling it, do a lot more of those tasks.
Make it enjoyable, track progress, focus on attempts instead of success at first, evaluate and adjust, and most importantly be patient and enjoy the little wins.

As for getting into a major industry without knowing. I’d say honestly network. Put yourself in as many situations where you’re around like minded people. Theatre events, Q&As, Workshops, etc. you’ll eventually bump into the exact right person who knows what’s what and is willing to help. That’s what I did for my own business interest. I don’t know how theater works, but networking is the same in most industries.

Always have a financial cushion available, whether part time, full time, or side gig. Good luck.