WikEmacs:Guidelines
Start with http://meta.wikimedia.org/wiki/Help:Wikitext_examples if you are new to MediaWiki markup.
Templates
There are templates defined for referencing variables, function, command, keys, manual etc. Use them for uniform experience. See [Templates].
Categories
There are special categories defined for Operating system, Emacs releases, Programming languages etc. Use these when possible or introduce new ones as required. See Programming languages.