Many lawyers major in history, public policy, or business, but theoretically you can major in anything. You then take the LSAT - the Law School Admissions Test - which is like the SAT but for law school.
Once you graduate, you have to pass the bar exam, which (depending on where you live) is a two day test.
And then, if you want to specialize in some areas (I think patent law, or maybe financial planning stuff), there is a second bar exam you have to take and pass.
You could opt into taking some English literature, public speaking and sociology classes while at college. Political science is also another option. All of these classes give a good foundation to study law at Law School.