If you decide to go into the armed forces (whatever branch), you owe it to yourself and to your family to go in for the right reasons and having done as much research as possible about whether it's really the best decision for you to make. If you are absolutely sure you feel up to making the commitment, then the next step is to research the different branches and understand what each has to offer you.
I'm a Navy vet. When I was first checking out the different branches of the service, I decided to go Navy - when I spoke with the Air Force recruiters, the only jobs available were mechanic-type jobs which I had no interest in - things may have changed now. I had no interest in the Marines, Army, or National Guard.
It is is true that the Air Force ate better food - while stationed at Pearl Harbor, I had some lunches at Hickam AFB. Much better than the Navy fried garbage and brown salads. Again, things may have changed since then.
I served as a Yeoman for the Commander THIRD Fleet admiral staff. I had the opportunity to work for various Navy officers (helicopter pilot, tomahawk missile officer, etc.), Marine officers, and a couple of Canadian officers and a Coast Guard officer. Most of the Navy officers were spoiled pricks, but the helicopter pilot was a great guy. The Canadian officers, who I primarily worked for, were also very cool. The Coastie was also a great guy - I got to work on SAR (search and rescue) operations as well as drug interdictions. Very interesting stuff.
If I had to do things over again, I would have gone Coast Guard. I regretted not investigating the CG when I was first looking into the armed forces. I had a B.A. degree prior to my service, but couldn't go into OCS off the street. I took the Navy officer test but fell short of passing it by 5 points. This was when I was already enlisted and had spent about 6 months in service - I realized then that I had a pretty good situation where I was and figured I would just get back out into the civilian job market when I finished and maybe work on my Master's degree using my GI Bill. If I had taken the time to explore the Coast Guard branch, I might have become a CG officer and made a career of it.
Whatever you decide, take your time and really do as much research as possible. Check out veteran message boards and other information so you can make the best decision for yourself, because once you sign up, you're committed.
Regarding the GI Bill - this is an interesting
article about that - if college financial aid is your only motivation for joining the armed forces, you may want to re-think your situation. Check out this
article, too.
From what I read, it sounds like you plan to be a lawyer. I recommend exploring financial aid options and work on your undergrad degree (business, history, etc. - it's all good for law school). If your SATs aren't up to snuff, go to a community college for a year or two first, then transfer to a university.
You're looking at 8 years of schooling (assuming you pass your LSAT). If you enlist first, you'll be postponing your education (unless you decide to do some online education while in-service) for a few years. It's up to you to decide if it's worth it to you.
While I would recommend just going straight into college, a good friend of mine did a tour of duty in the Navy, went to college, then law school. He's a successful lawyer working for Apple now. He would tell you, though, it was his education that got him to where he was, not so much about his time in the Navy.
The discipline I developed while in the military has helped me in many aspects of my life. I was fairly immature in my youth, lacked structure and lacked a serious game plan to map out my life at the time. The discipline from the military and the pride for serving my country will stay with me forever.
That said, I have to be honest and say I couldn't wait to complete my tour of duty after my first year in service. Like many others, I counted the days until I got out. I just realized that it wasn't a career I wanted to pursue, but you can't just up and quit (at least, not without serious ramifications). It was a long 3 years (full tour was 4 years). Still, I made the most of my situation.
Good luck with whatever route you decide to take.