Stanford is well known for its opportunities in both technology entrepreneurship and social entrepreneurship. To get started, you might check out the Stanford Technology Ventures Program, StartX, the Business Association of Stanford Entrepreneurial Students, Stanford Pre-Business Association, and Stanford Women in Business. Information about these groups and additional Stanford groups can be found via Student Affairs.
Stanford does not have a pre-business major. Some business-oriented students choose to major in Economics or in Management Science & Engineering, but don’t assume that you must do so. A major in any one of the humanities, social sciences, or sciences, perhaps supplemented with a minor or a wise selection of business-related courses, can be excellent preparation for a career in business. Be aware that if you are interested in going on for an MBA, nearly all programs require a few years of work experience before beginning an MBA program, decreasing the importance of the specific major field.
Consider taking a one-unit speaker's course that will help you explore different arenas, such as MS&E 472 or URBANST 131. These are open to all students. Classes such as MS&E178 and URBANST 132 and 133 build on those respective lecture series in different ways.
You may want to check out ECON 1 or these other frosh-friendly Econ courses. Other possible courses include ECON 5; ENGR 145, 150; SOC 161; MS&E 175. Try a keyword search in ExploreCourses, using the topics that interest you most, to find more possibilities. In addition, there are opportunities for undergraduates to take classes at the Stanford Graduate School of Business, usually after your first year at Stanford.
For advice regarding a career in business, there are pre-professional advisors in Sweet Hall who specialize in advising students interested in careers in business. Students may also check out BEAM Career Education for additional resources and paths to connect with alumni in your desired career field.