There's a wonderful book that will break it down better than any answer here. Don't Go To Law School (Unless): A Law Professor's Inside Guide to Maximizing Opportunity and Minimizing Risk

My advice? Use your business degree now. Start earning. While you’re there, leverage what is before you: talk to your legal department. Make friends—most attorney’s are rather affable. Ask to assist/observe with in-house transnational or litigation matters. (… I’ve had friends have their J.D. programs paid for this way.)