Oh, I'm not discouraged. I'm just not sure I'm the man for the job. I think maybe someone who has actually read the books might be much better suited for making an interesting, accurate, and enjoyable expansion. Otherwise, I might oversimplify it.
I read the books over 20 years ago, and I'm not sure what I can remember (other than the fact that I liked The Hobbit better). I'm drawing my inspiration from the Lord of the Rings Trading Card Game (which is still playable online).