The BIG thing to remember, and what throws lots of newbies off, is that the Organizer (or Bridge, but I don't use it, so I'm guessing) isn't where your files are actually stored. It's just a catalog (like ACDC, too) that gathers your info and thumbnails so you can easily see them.
I helped a friend get set up this past weekend, and I told her it's like a Pottery Barn Catalog: The catalog just is a photograph and information about the item, it's not the item; the item itself is on a shelf (or in a file folder on your hard drive!). You use the catalog to tell your computer (or the customer service agent on the phone) what item you want. But, you first have to put the items on the shelves where they belong! ( Picturing a huge IKEA warehouse where you pick up your boxed table, Aisle 21, Bin 35, Row D!) Then you tell the catalog where the items are by importing and tagging. Viola!