Reminder to tune in to your NPR station that carries the Met broadcasts, starting at 11 AM.
Walküre is the greatest of all operas. I get a lump in my throat just thinking about it, before the music even starts.
You will need to study the libretto or at least be reading it as it unfolds (unless you already know it). A good German/English rendition can be found with a little google searching.
See also my colleague’s excellent synopsis of the first act, to whet your appetite.