SEAL wrote:How exactly do you create a new page on the wiki?
That's easy; just type in the name of a page into the search box. If the wiki can't find it, it'll offer you the option to make it. As for linking to the new page, you'd need to edit a page where you want to put in the link and then use the little link-making button on the WYSIWYG editor to make the link (or, if you'd like, you can disable the rich editor and use pure wiki coding, but that takes a little more getting used to).
As for messing up the wiki, don't worry. Wikis are designed that in the event of a true mess up on an article, things can be reverted to a prior state.
Edit: as an aside, the edits I've seen you've made all look good. Tried to make editing the wiki as simple as possible for interested members.