This Community Portal is designed to help editors find something to work on. It covers a range of ways you can share your Tolkien knowledge with the world including creating wanted pages, expanding stub articles, cleaning up poorly-written pages and added references to articles in need of citations. Some of the work might be a little tedious, but a little goes a long way in continuing to build the world's largest Tolkien encyclopedia.
If you have any questions, feel free to ask. You can ask a specific staff member on their talk page - they're happy to help you out.