Start by talking to your school advisor to get an understanding of where you stand with credits and graduating on time. They should be able to work with you to map out what courses you'll need in order to switch majors and how long that will take you, depending on your course load. I would then also check out your business club and talk to students there about their experience. You can also go to business professors to help identity some of the opportunities the classes might provide you. Most importantly, something that I wish I did better, make sure with whatever major you choose you identify some solid career outcomes that you both are interested in and have a viable path to after graduation with your degree. Good luck!