My questions

Hello, I'm thinking of adding this forum to my website. But before I do: 

• Is it possible to make it so that you search for a page to add the post to, and once you send the post, it appears on that page as a comment? 
• Is there an upvote system, and if not, how can I add one? 
• Is there a moderation system, and how can I add moderators? 
• Do I already have to have a user system or does this forum come with one? 

I'll probably ask more questions in the future, I would really appreciate your help so I can make a great and successful website!