I agree with much of what has been said here, but would emphasize that the best way to approach this is to look at what in your current situation makes you happy and where you believe you would like to be in the future.
When you get into law school you will find different classes that you really enjoy and others that you're just getting through. Once you identify which ones strike a positive note with you reach out to attorneys that specialize in that area and pick their brains about what they like and don't like about their area of expertise.
Also look at where you think you'll want to live after law school and identify if there are any practice areas that need more attorneys. Hopefully that will coincide with one of the areas in which you have an interest.
I am also not currently practicing law, but the years in spent in law school and practicing business law provided me a great basis for success in my current position.
Finally realize that often what you think you'll like at a start does not turn out to be where you end up. Be willing to constantly reassess where you are, what you really enjoy and how that all fits into your future plan. This is true even after you begin practicing.