I am a college senior interested in opening my own reception hall in the Pennsylvania, Delaware, or New Jersey area. How do I go about making business plans for a reception hall business.

You could start by clicking on either of the two links here http://www.sba.gov/ and SCORE "Counselors to America's Small Business" On those two sites you can ideas for developing a business plan for yourself and also get excellent advice. Developing small businesses is exactly what they are about.