You just have one notebook. I know some other apps like OneNote, Circus Ponies, etc. allow more than one notebook.
The app does not have glances (yet anyway).
You can access previous entries from the app by simply scrolling down from the quick entry screen. If you select one, it pulls up the full text of the note as well as added info (photos, location, etc.) in a scrollable format. Inside the entry you can click on photos to go to the full watch screen size version and you can click on any location info to pull the address right into the maps app on your watch. It's pretty slick! The items in my notebook were existing from my entries via the phone and mac and all were very use-able in the watch app (although some were a bit long to scroll through).
For adding entries, it offers a location button, dictation button, camera button (which pulls up the last couple of photos you took for selection), then six customizable quick entry buttons (defaults are things like reading, working, exercising, eating lunch), then below that are your recent entries. Mine shows 10 entries back. I do not see a way of going back further, so that may be a limitation for you.
Watch screenshots are large and pixelated on the mac version, not sure if they will address this. They are a bit annoying.
Hope that's some helpful info!