Just to get started, here are some links to information on the Versailles Treaty:
http://www.fordham.edu/halsall/mod/1919versailles.html - Main terms of the treaty
http://www.firstworldwar.com/source/versailles.htm - Detailed analysis of the treaty
http://www.historylearningsite.co.uk/treaty_of_versailles.htm - Basic description of all the main issues
Pay special attention to this clause, the so-called 'War Guilt Clause':
Article 231. The Allied and Associated Governments affirm and Germany accepts the responsibility of Germany and her allies for causing all the loss and damage to which the Allied and Associated Governments and their nationals have been subjected as a consequence of the war imposed upon them by the aggression of Germany and her allies.
Pay special attention to this clause, the so-called 'War Guilt Clause':
Article 231. The Allied and Associated Governments affirm and Germany accepts the responsibility of Germany and her allies for causing all the loss and damage to which the Allied and Associated Governments and their nationals have been subjected as a consequence of the war imposed upon them by the aggression of Germany and her allies.
Here is a map showing some of the territorial consequences of the treaty (found at http://www.johndclare.net/peace_treaties4.htm):
