Lenin said it best: “Without Revolutionary theory, there can be no Revolutionary Movement.” That's why I open up my list with that quote, to instill its necessity. You ask a good question, why is it that we need to read theory? The answer is that theory guides practice. This applies to Anarchism as well as Marxism.

To use an example, is it sufficient for surgery to be performed by the untrained but well-intentioned? No. Must all nurses be trained in neurosurgery? Also no. What you are describing is a vanguard structure, an element of the Working Class movement made up of the most well-read and well-practiced revolutionaries that can help "guide" the working class as a whole, the vanguard being akin to a spearpoint that the great masses of the working class push forward. The only way for the Working Class to accept the vanguard is for the vanguard to do good work for the masses, connected to the masses, by the masses, for the masses. This is what the Black Panther Party did when feeding children, as an example. They solved real problems in their community.

However, not everyone agrees with such a structure. That's why it's important for as many people as possible to read theory, because this not only creates more teachers of theory, but allows more discussion surrounding theory. To that end, it is not necessary for everyone to read theory like it is necessary for everyone to get organized, but reading theory is paramount to improve the effectiveness of organization. It does little good to have a bunch of well-read individuals who endlessly critique society but never work to improve it through organizing, just like it does little good to have aimless organizing guided by vibes and no theory.

My introductory list is just that, an introduction. You won't come out of it some grand Che Guevara style revolutionary figure. However, you will be equipped to deal with important questions and problems you come across when organizing, and how to overcome them.