Well, remember we won't simply answer your questions for you, rather try and direct you towards helpful information.
You've asked five massive questions, each of which can be answered with an extensive essay. I would suggest you begin using the Internet to research the Treaty of Versailles.
These sites will help you in your research:
http://www.johndclare.net
http://www.historylearningsite.co.uk
Please don't simply post questions and expect them to be answered. Rather rude and impolite don't you think?
Once you've done your research on those and other sites, do feel free to return and ask from some extra assistance about specific points. That is where we can help!