This website has a great guide and a ton of resources to help you get started.

This video has another good breakdown on what to do. The channel itself is pretty good. I would recommend you watch his series on the Genki books if you get your hands on them (there are pdfs out there you can acquire for free).

This guy is a cunt at times but some of his videos are really good.

The important thing is to make a habit out of studying, as willpower alone won't be enough for the long journey ahead. The book Atomic Habits is a good one that can give you some tips on how to build and maintain habits.