Charles, as Presley and others have alluded, this whole timeshare thing is incredibly detailed, complicated, and confusing--as the title of your thread implies. I want to encourage you by saying that you're doing a number of things right: 1) you haven't (like so many of us did) bought first from a developer at a grossly overpaid price and asked questions later--nice going!; 2) you're trying to unpack this whole timeshare thing and learn what it's all about; 3) you've come to the right place--TUG is a tremendous resource.
You also should understand that it's complicated for a number of reasons: 1) there are many developer companies, all of which have developed their own systems, their own points scales and pricing, and their own rules about reservation windows, upgrade opportunities, cancellation policies, and the like; 2) it actually behooves the developers to make their systems complicated, because they are first and foremost motivated by profit--and if they can keep their owners from fully understanding their systems and squeezing every last penny out of their ownership, that tends to work to the advantage of the developer; 3) the market is dynamic--so that just when you feel like you've got a good handle on things, the rules get changed or new programs are introduced that must be learned all over again. This is happening now within both the Wyndham and Hyatt systems, for example.
Presley's advice is sound. It really will take you months to read and absorb how these systems work. TUG moderators have provided very useful stickies at the top of each of the various systems' BBS boards which will help familiarize you with how the systems work, property locations and points and seasons charts. You should read and absorb those, as that will also help you to begin to narrow down which system or systems you think will best meet your needs for future vacations. Once you've done that, I advise you to just dig into the BBS of the system(s) you prefer. Your questions will begin to be more pointed, more precise and less general, and you'll have more confidence about making your first purchase.