HERE is a tutorial on how to use Dokuwiki.1)
I'm also using several extensions and can add more if you want; the main ones that might be useful to you are:
nspages is mostly for making a table of contents page for a namespace; you can just use this text if you do: <nspages -tree -r -exclude -subns -pagesInNs -h1 -textNs="">
To make a new page, just navigate to it, either by making a link to it or directly editing the URL. For example, if I wanted to make a page called "Meals," I'd change the URL to "friends.teddymccormick.com/meals". Then I'd just click Create This Page on the right.
If you want your page to be in a new namespace, you can just include that with a slash. So if I made a page called meals/breakfast, I would actually be making a page called Breakfast in the Meals namespace. This should theoretically stack indefinitely; meals/breakfast/eggs should make an Eggs page in the Breakfast subnamespace of the Meals namespace.
Pages called "start" are special; they don't show up in the sidebar. Instead, they're assumed to be the start page of a new namespace and will be the landing page of that namespace.
If really you want to make your namespace its own thing, you can make a page called "sidebar" in that namespace, which will replace the sidebar for it and all subnamespaces.2) That will mean the sidebar doesn't auto-update anymore, though, unless you use indexmenu or nspages.