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Frankly, that GPA could be a deal-breaker for you. There are no top-tier business schools who typically accept applicants with a 2.7 GPA and no work experience. So where you go from here depends on how much risk you want to take on: if you apply to top-ten schools such ash HBS or Stanford, your statistical chances are low, but you might trust yourself to be able to talk your way in. Somebody does, why shouldn't it be you?
On the other hand, if you want to be sure you're getting the MBA you need, you have two options: one is to take the time to do something about those grades, whether it means doing a re-set on your Law studies or taking other coursework. Get your numbers, at least in your last semesters, up to a place that would at least put you on the dartboard for your chosen schools.
Another option is to target schools that specialize in entrepreneurship, such as Babson, which has a stellar reputation for producing hands-on entrepreneurs and has lower GPA expectations. The Babson MBA would get you into your chosen field a lot faster.

Good luck!
Margaret Strother