This is now very old, but it is still a good introduction, and has formed the basis for other studies. You can buy this from the Sales Page on the TS web site. It depends what you mean by speak. There are bits of grammar worked out quite thoroughly, but not the whole lot. Tolkien himself said that he did not have the urge to converse in Elvish, which was just as well because he did not make enough to converse in, except perhaps about stars, trees and death.
Some language enthusiasts out there write short poems in elvish for much the same reason.
We have a feeling this is not what the Elves would have said in similar circumstances. If you want to learn more, consult some of the language sources in the previous question. Apart from the maps included in the books, there are a number of poster maps. Have a look at our sales pages where we try and keep listed those in print. The book An Atlas of Middle-earth by Karen Wynn Fonstad is an established favourite.