Information on creating and editing pages can be found here on the MediaWiki site:
Don't be afraid, it's really easy. The easiest way to create a new page is:
- Find a page that looks like the one you want to make.
- Click "Edit" at the top.
- Copy the contents of the edit window, and click "Cancel" at the bottom.
- Go to the page you want to create and click "edit this page".
- Paste the old page, and edit it as you like.
- Be sure to preview your changes, then click "Save page".
- That's it!