Fascinating job! I had an Elvish dictionary when Lord of the Rings was popular...
I am fluent in English, French and Italian, on top of my native Romanian, a language with many influences Slavic, Turkish, even Gypsy words. Also i studied linguistics in college, so I have the professional skills for the job.
And I have the interest. I write fiction myself, a lot of sci-fi and i've always had a problem with what language the aliens might be speaking. I did come up with a few alien words, but just a few, as a short story does not offer much space to present a whole different language.
I would love to hear what you have in mind, if you;re planning to use a lot of alien language, whole senteces or maybe just words.
Avos t'ien daro! (which translates roughly as until I speak to you again)