First, start with the Interactive Tutorial. It will save you days of frustration and also give you a good working vocabulary for asking questions on the forum. You can work on it in short spurts, and then reopen it later when your head’s not spinning.
Second, you need to figure out how to get all of your source material into a standard word processing format. e-books won’t open inside of Scrivener (they’ll import, but the text won’t be available to the program directly). Good formats to put them into include ".doc " (MS Word) or “.rtf” (Rich Text format).
Then, in the research folder, create a sub-folder for each big source, or kind of source if there are a lot of small bits. Now, take the ORIGINAL files (if possible), and the converted .doc or .rtf versions of those documents, and drag them into their places in the research folder. That way, you always have all of the original material in your project, should you need to see it in it’s pristine format. If you can’t convert some formats, then you’ll have to copy and paste them into new documents you create in the binder.
You may find that the formatting is a mess at this point, with a plethora of fonts and indent settings that make everything together look like a kind of ransom note. Select as many of the converted documents as you can in the research folder, and then go to Documents->Convert->Formatting to Default Style to clean that up. It will preserve italics and bold, but will not keep any indents, including block quotes by default, so beware of that.
Once you have your converted version imported, you can split them up into useful chucks (the book, for instance, might be sub-divided into chapters if you think that’ll be more convenient.
Then, and only then, are you ready to start dragging these converted duplicates of the original source materials into the draft folder, as you begin incorporating them into your video script. Keeping the source material that you add to the script separate from your own writing might be convenient, but at that point, it’s entirely up to the requirements of the project you are working on. If you are using small excerpts, you might chop up a chapter into smaller chunks, or just copy & paste small passages as quotes.
There are a wealth of features that you might find useful. If you keep the source material separate, then you can, for instance, use Keywords, or References, or create [[Scrivener Links]] to the original material that you are using, which may come in handy during editing.
By going through the Interactive Tutorial while you’re pondering how to organize this project, you will almost definitely stumble upon features that can be bent to your needs.