Anyone have advice for business internships?

Hey everyone, some background info: I am a Junior in college but I am only 18. I have a 3.95/4.00 GPA and I am looking for a spring internship. I run a business in the summer which limits my internship possibilities, but I am looking for some guidance. Should I just get a part-time job in a business related position until summer? I am trying to break into software sales so I feel like working with a software company early on could help. Thanks!