If all goes as it should, the United Kingdom will offer to give the Polish Corridor to Germany. Poland and the Soviet Union will refuse to agree to this. Britain will reluctantly threaten war, (France is even more reluctant) and call on the British Empire to support the United Kingdom, as was the case in the first world war. Here is where the bottom will fall out for the UK. All its colonies, led by India and supported by all the colonial subjects, will challenge Britain and France to grant immediate independence as the price of supporting the UK and France in the war against Germany. If the UK refuses and goes to war against Germany, all the colonies will take advantage of the situation to revolt and gain independence. Thus, if the British decide to go to war, one way or another the Empire will mostly be lost. France is more or less in the same position. The Asian colonies are supported in their position by the Empire of Japan, which is intensely anti-communist and engaged in a war with China. Each of the Chinese delegations is trying to use the Japanese to destroy the other Chinese military group; confounding the issue is the fact that General Chiang has received substantial military assistance from Germany in the mid 1930's. Thus, in mid and east Asia and some extent Africa, the issues of colonial independence are more significant than German expansion per se.
After each session take time to research the needs and positions of your own country or national group. After the second session you may want to meet with other delegations that have similar needs or who may be able to grant your needs in exchange for your support of the positions they express in the meeting.
Peace will only come if most of the players can buy in. Otherwise, session after session will need to discuss, re-propose, renegotiate. Possibly--quite probably--peace is not reached. End the conference when it seems to be at an end and exhausts the issue (and the students).