What is a Wiki
A wiki is a special kind of web site that users can edit. The idea is to have a community maintained body of information and knowledge. The WikiPedia project is probably the most well known but there are many wiki's out there.
We're using the same software as Wikipedia so if you're familiar with it then you're off to a great start.
Editing can be done in place. Information aobut how to edit pages in MediaWiki can be found in the [http://meta.wikimedia.org/wiki/MediaWiki_User's_Guide:_Editing_overview Editing Section] of the media wiki.
We're just getting started, so there may not be any templates yet, but keep abreast of them as they develop. Using templates will help keep the site flowing and managable.