Reference on meta: http://meta.wikitolearn.org/User:Grigoletti/New_User_Journey

The idea is hierarchical:

When the user is on its user's page, like User:Bob it should see an input field with a botton that asks to create a new section. If he writes the name of the section and press the button, then a new section under the user's page url is created. In that section he will also have an input field where he can create chapters. If writes something and go ahead, then a new blank page with the name of the chapters will be created.

To accomplish this kind of behaviour I saw this:
https://www.mediawiki.org/wiki/Extension:InputBox