How can I publish a website using my own computer? [closed]

assuming I have HTML, CSS and JavaScript files and now want to upload them to a web server so that anyone can access them via a domain or IP.

• How do I proceed?
• Do I need a domain (in form of: www.[name].de) or
  does an IP address work?
• How do I publish the code
• How do I make
  sure that the visitors of the website can interact with each other,
  e.g. through a chat?

Thanks in advance