If you REALY want to learn elvish then I suggest this website;
http://www.uib.no/People/hnohf/index.html
It not only gives Elvish (Quenya, Sindarin, Telerin, Nandorin and Primitive Elvish) but also Dwavish, many tongs of men and a small section on Entish.
Be warned, this site looks into the structure of Elvish words, phrases ect. So you may want to check out the Quenta Course and such before going rashly into getting a word tattooed on you. You never know if it is wrong.