First priorities: 1. Make sure the translate extension is in place and working well. If not done yet, or not enough, we need a few test users and pages to play around with. (already done some of it) 1.a. Add an easy link to Special:PageTranslation for members with pagetranslation permission. 1.b. There are a few goodies that don't seem in place yet, like knowing that "en" is the main page (not a translated version) or recognizing user's language from sm.org forum. 1.c. There should be links to available languages for translated/translatable pages directly on the page, a combo perhaps.
2. Document how the extension works, for administrators and for translators. Useful doc: http://translatewiki.net/wiki/Translating:Page_translation_feature This documentation should be in the wiki itself, though a topic/blog on sm.org community forum should point to it.
3. Import into the wiki the existing translations for a number of pages.