I recommend starting with the Main eBook first and then watching the videos. You can listen to the audio files at the same time you are learning the Main eBook content.
There are progressive lessons which build on top of one another, and it is helpful to take them lesson by lesson.
When you have watched all the videos and read the Main eBook, read the second eBook, the Stroke Guide.
This is your end game, your goal. You will know what you are going for. But please, start with the main exercises in the Main eBook first! Do not try the Stroke Guide until you have done the exercises in the Main eBook.