Yes, I can very well relate to this, and the only reason I am able to find my way through it is that I have listened to many talks by Bhante Sujato on this matter and read much of his writings. The organization of the texts on SC nicely mirrors the way the canon is organized, and once one has understood this it becomes actually easy to find one’s way through it. At least that’s my experience.
There are a number of guiding and introductory texts that can be accessed from the SC home page which I haven’t actually all gone through. But if you scroll a little down until you find “Tipiṭaka—the three baskets” and click on “More” in the “Discourses” section you find some explanation the fourth chapter of which may be helpful in this context.