Fund-raising?

Hi. I am 13 and my sister, cousin, and I were selected to go to People to People. We will be traveling to France, Austria, Swizterland, and Italy for 20 days. This is going to be great but very expensive. I need some fundraising ideas so please help me out. We need a pretty big amount by june 2008. if you have any ideas of really profitable ones, or things, let su know....Thanks !