The first thing you need to do is to have a serious talk with your parents and see how much they are willing to contribute towards your education. Next thing you need is to have them fill out Cornell's online financial aid calculator Financial Aid Calculator | Financial Aid
which is usually very accurate if filled out correctly. The package you get will be basically what you get if accepted to Cornell. There are appeals, however they are generally only successful if there was a significant change to your family's income/financial situation.
If your parents' combined income is under $60,000 and their total assets, including primary home equity, is under $100,000, you receive a full ride i.e a financial aid package that covers the entire cost of attendance.