My short guide here may help you understand the parts of Aperture better, which in turn will help you ask specific questions.
I advise all users of Aperture to read and understand the first seven chapters of the User Manual -- it's available on-line, as well as via "Help➞Aperture Help" -- as they provide a tour of the interface.
You are going to have to do some work. I can tell that you are confused -- Aperture, assuredly, is confusing at first -- but I can't tell what you are asking. You need to distinguish, in your questions, between the files you imported (Aperture calls these "Originals" after you've imported them) and the Images in Aperture (Aperture refers to these as both Images and as Versions). Every Image has an Original. The Original (remember, it's a file) can be stored inside the Aperture Library package, or outside the Library package. These distinctions are covered in both of the resources mentioned above.
If nothing makes sense, post back and we'll see how we can help you.