In the Classic version, it lists 3 Norton Anthology books. The only one of the 3 available on the bookshelf is Norton Anthology of English Literature. It talks about new editions being printed often.
Is the one available on the bookshelf the version that will work with Classic TOG, or do I need to look for an older version?

Also, for veteran Classic users, I am assuming I will definitely need all 3 of the Norton books listed. Is that what you found to be true, or did you find the online helps the curriculum talks about to be OK?

I can't answer your specific questions - but one good thing, if you decide you need to buy them all, is that you won't need the most current versions, since the Classic volume was almost certainly written before the most current versions came out. So you'll be able to buy them used, at a substantial discount, if you want to. The only problem is finding the book in decent condition!