Instructions on how to use MediaWiki syntax to create pages and things to consider in general.
Basic guide for wiki editing (can link to external guides, but will involve writing some specific stuff pertaining to how we intend to structure our approval process for making changes)
Helping people learn how to use the wiki interface and write wikitext (the markup language that Mediawiki pages are written it)
VisualEditor can help people write pages without necessarily knowing wikitext