check this out , you'll find most quotes plus soundfiles of them there
mah is right when he says a good deal of ppl speak and write elvish but almost no two ppl their elvish will be the same for there is no real way of learning it atleast not for the common public as far as I know
I mostly use the dictionairy I found it is by a company called grey heavens wether or not it is lotr elvish the real elvish I dunno
I just use that one because my role playing friends use it