This is incorrect. Hanzi have both phonetic and semantic components. See, e.g., this discussion. Given a previously unseen character, it is possible to make an educated guess on both the pronunciation and meaning of the character by evaluating its components.
You might search through the site for Mandarin and other language learning threads on this site, which have substantial discussions of learning Mandarin. Here is one thread where I previously shared some resources.
My sense of your initial query–developing a major system for strokes–is that it would be highly inefficient, unless your primary interest is in calligraphy or the evolution of written hanzi over time. If your ultimate goal is language acquisition, you might find this focus on character strokes very tree limb oriented if you’re actually interested in the trees themselves and the forest in which they grow and have meaning.
For most contemporary learners, learning to hand write characters does not result in better learning outcomes compared to alternate input methods.