Here is the link to the officer recruiting page.
http://www.navy.com/careers/officerplanner/ This should give you all the info you need about the opportunities the navy has to offer. Since you seem to have an interest in law, you can also be commissioned as a JAG officer and the navy could pay for your law school (I believe this is still going on) I would check into that as well. Also, it seems like a major driving force behind your decision to become a naval officer is the job market. If that's the case, I would wait until you finish your masters degree because a lot more doors will be open to you with a graduate degree, because you really need to have the desire to do this to be successful, and this is coming from experience. However if the Navy is what you want, I have to say as a Naval officer it is one hell of a ride, but be sure you are willing to accept the good with the bad and understand what you would be getting yourself into. It is a lifestyle not just a job. Good luck.