You can use our free FAQ plugin to add the FAQ to your Knowledgebase. You can get it for free here: https://wordpress.org/plugins/helpie-faq/
Absolutely. You can order your topics in any way you want. You can also choose ordering based on alphabetical order or recency or number of articles in a topic.
Right on, you can! Just go to Helpie Settings -> User Access. You have all the restriction features you need.
Yes, the table of contents shows the headers inside the article when you navigate to that article. You can control this in Helpie Settings -> Components.
You can add other users and access them a particular WordPress user role ( editor, author, etc ). Then you can go to Helpie Settings -> Core to assign publishing capabilities to these roles.