Your final product will be a web / Wiki page that introduces your game to the world!
It will need to include the following:
Game.exe file
You will also get a CD and case to present your game on.
Gamebox cover
Use Paint Shop Pro or Publisher (or good old pen, paper, glue and scissors!) to create an atractive cover for your game, complete with blurb on the back. If you're clever you may be able to find some pre-made Wii / XBox / PS3 templates that you can modify. Here are some custom-made examples to give you an idea.
Using images and screen shots from your game as well as historical images from your time period, use Movie Maker, PhotoStory or iMovie to present a 30 second advert for your game, designed specifically to appeal to your target audience. Sound, both voice and music, will be very important here.