As I discuss in "Law School Labyrinth", the irony of study aids in law school is that almost everyone uses them, although no one actually admits it that first year. I guess this is because no one wants to appear to be struggling or not "getting it", even though pretty much everyone around them is going through the same struggle.
The truth is that without some sort of roadmap to the course, it's pretty difficult to figure out the end destination. Some casebooks are well-organized, with beautifully-constructed tables of contents. Others are poorly-edited and rambling, a monument to some law school professor's zeal to publish, regardless of quality or content.
That said, I would also advise against going to extremes in this regard. If you overwhelm yourself with extra reading, on top of the hundreds of pages you may be assigned each night, you will merely overload an already overloaded hard drive. You can also find yourself needing additional student loans to find that perfect outline. If you look carefully, there are numerous free materials on the Internet and yes, even in your law school library.
Use study aids as aids, and not as a substitute for wresting with the material. Study aids can be a sort of "user's manual" to the course, but you actually have to roll up your sleeves, learn the law and legal principles, and develop your legal reasoning skills the old fashioned way- through hard work.