We invite everyone to contribute. Just pick a topic, write an article. Click on the "Edit text of this page" link at the bottom of every page to edit a page; for more information, see HowDoesOneEditaPage. The articles don't have to be long; a little bit in the early stages will help a lot. You can do so anonymously or give yourself credit. If you see an error, you can instantly edit an article to fix it.
Let's discuss the mechanisms of WikiPedia on WikiPediaProcess. See the WikiPediaFaq for answers to many questions.