Best way to start is to start. Make shit films on your phone if you have no equipment. That truly is the best and only way to learn. But for extracurricular learning (equipment, cinematography, editing, etc) youtube is a good textbook

I was in your position 2 years ago. My advice would just be to ask your friends even if they aren't currently into it. 2 years ago a new kid at my school asked me and a few others to help him make skits with him, they were all awful and embassing but its where I fell in love with the process. So ask your friends because they might have an itch they don't even know they need to scratch

A few friends and I set out with the ambitious goal of making a short every month.