Help Getting Started with the WIKI
If you want to create a new page, just create a link to it, like this (view this page's source to figure it out). Then, go back and click on the link.
If you have never used a WIKI before, you should probably glance over http://meta.wikimedia.org/wiki/Help:Editing
For more help with basic page formatting, please see http://meta.wikimedia.org/wiki/Help:Editor
If you want to create Wiki articles from MS Word documents, there are macros for converting document from MS Word to WikiMedia format.
If you want something even easier, use the MediaWiki plug-in for OpenOffice.