danb, I would recommend Helge Fauskanger's excellent website,
Ardalambion, which has a 20-lesson Quenya course
here.
A word (or three) of caution, though: first of all, because Quenya is an incomplete language, there is, in a sense, no such thing as "learning" it, the way you'd learn (say) French or even Esperanto. Second (though you may already know this), it really does work like a foreign language, meaning that it has a completely different underlying grammatical structure to it than English. (On the other hand, whenever you learn more about a foreign grammar, you end up learning something new about your own!)
It's been a while since I've been through the course, but if you're willing to work through it and need a buddy or a different way of explaining things, you can send me a private message. But I don't have the time to
teach someone a language that I myself only know a smattering of.