One thing to keep in mind is that for most people who get an MBA the whole process and mindset is different from people who get JDs. A law degree is pretty much a required pre-requisite. Your law career generally doesn't begin until you have that degree. A career in the business side of business is different. For most of us, myself included, the career has been ongoing for years and the MBA is just a springboard to help you further that career (or to help you change the direction of that career).
My point in saying this is that I think it might be premature to start thinking of what you want out of an MBA when you don't really know what you want out of a career. My advice would be to try to build experience in the areas you refer to as soon as possible. See what you like and don't like. See what you're good at and aren't good at. After a couple of years in the workforce you'll have a whole new perspective on whether you want an MBA and what you want to get out of it. Then the whole MBA search/application process will be a lot clearer and more satisfying.
It's good to think ahead, but don't get too ahead of yourself!