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To figure out which major you should declare, decide what kind of career you see yourself doing in the future. If you aren't sure, try visiting your Career Center and take assessments to see the compatibility between your personality and the careers associated with it. Then, visit with your Academic Advisor to see what the major incorporated with the career entails. I hope that is a good start for you.
As for attending a university that is inexpensive, it is hard to say, but if you decide to stay within the state of your residence, tuition is lower and if possible, look for as many scholarships as you can and apply. I did this same thing and till this day, I don't have any loans or debts for school. At least, not until Graduate school. As for the curriculum, I would recommend finding the universities' (that interest you) curriculum for your major and see what the differences are and have an overview of what the courses entails.
This is a start, but if you are still confused and want immediate advice, try to schedule an appointment to see your Career Counselor or a Career Center in the community. They would be able to tell you more about making decisions in conjunction with careers and majors. Good luck!
Have you taken your gen eds yet? I would say get through a year or so of those before declaring a major. I declared my major as Business as a freshman, took my gen ends, changed majors 5 times and ended up back at Business! I would also suggest looking at jobs currently available and see what peaks your interest and what you are drawn towards. Or ask yourself if you didn't have to worry about earning money, what would you choose to do everyday. Good Luck, but don't worry about declaring a major too much!