If at any point you wish to test your wiki skills, without causing damage to anything serious, you can go play in the Sandbox. All works-in-progress should go in the WIP: namespace.
You can also ask people in the Discord chat for help.
The easiest way is to edit in a link to the page you want to create and then save the page and click the link you made. That'll go to a “This page doesn't exist yet” page for your link you just made. Click “Create this page” and create it. You can also just type in something like stararmy:Type 36 Starship Railgun in the search box to set the page location to stararmy:type_36_starship_railgun.
Make sure to add a ====== Header ====== to title your page - it'll determine how the link appears on pages that link to it. See the steps below:
See also: Wiki Namespaces