Please feel free to edit pages, and create new ones. If you haven't used a wiki before, then I suggest you play in the Sandbox first. The sandbox is page that is meant to be trashed - experiment to your heart's content.
If you are worried about not knowing how to use the special wiki formatting rules, don't worry, just use ordinary text, without any formatting. Who cares if you don't use headings, and bold text, and underlines etc. By the way, whenever you edit a page, there is always a reminder of the most often used formatting rules on the left of the page.
Why not trey editing the Sandbox.