Hi Julie,
Before you commit to a lot of time with Organizer, you may want to consider ACDSee Photo Manager. Many have had Organizer bog down at 20 gig or so.

With ACDSee you can import your tags from PSE & then start with that.

We also have premade categories that can be imported.

You can see what we have here. It may give you ideas about organizing even if you decide to stay with PSE too.