I've been busy lately, in spare time was reviewing one good book.




https://www.packtpub.com/adobe-flash11-stage3d-molehill-game-programming-beginners-guide/book
Despite I've quite experience with Papervison3D redoing and enhancing original library support of Open GL from Flash 11 player changed things alot.  You probably wouldn't  code low level very often (probably when creating custom shaders and particals  thru AGAL) but you would use high level libraries like Alternativa, Away 3D...
You can fill the gaps of your 3D knowledge  with this book as I did and also learn how above libs work under the hood.  Book give some optimization tips for best performance and information of advance topics . Good thing is that learning of Stage3D goes thru building of example game.