To make an amazing wiki , we try to keep a consistent style between the pages. For the nation pages, you can use the EA Ulm and Lanka pages as a reference. Try to keep that style and layout on the other nations.
In general, you can edit a page and see the syntax used there. If you use the preview button, you don't have to worry about messing anything up. If you'd like to, you could check out the entire syntax available at the syntax page. There's a couple dominons-specific extensions and syntaxes you can use too. Feel free to play around by editing the playground page.
The very first thing on each page should be a top-level heading containing the page's actual title (e.g. this page's ====== How to Contribute ======). This title is used automatically at a couple places in the wiki.