What should I study before I can study?

I have been practicing yoga for 2 years (bikram mostly, but taken many workshops of other practices), and I would like to become a teacher.
I don’t yet know what discipline to follow, but that doesn’t matter because I cannot dedicate time away from home for 200 hour training until next year.

Can anyone please tell me what I can study in the meantime, or what are reputable distance courses (I undersand there aren’t any recognized by yoga alliance) that I can read/take in the mean time to prepare me for when I have the time to immerse myself in training?

Thank you!

? Asana Pranayama Mudra Bandha by Swami Satyananda Saraswati

? Hatha Yoga Pradipika by Swami Muktibodhananda

? Light On Yoga by B.K.S. Iyengar

? Kundalini Tantra by Swami Satyananda Saraswati