Your guide seems to be focused on absolute beginners of music considering you have introductions to theory so i would say the number 1 step should just be to make music with anything no matter what it is or how good it is. Record it the cheapest way possible, not concerning yourself with quality or if it's theoretically correct. All the best guides no matter what subject always teach that practice will get you farther then any certain equipment or studying courses or watching others. Then, when you start hitting walls in your practice, you can then youtube up what your problem is or look for tools to solve it. Otherwise you are wasting a bunch of time and money on tools and methods that you might find you don't even like. Walk before you run.