If you decide to join(regardless of service), no matter what your recruiter promises you, GET IT IN WRITING! If you have it in writing and they tell you to resign, there was a mixup but everything is the same, MAKE SURE IT IS THE SAME! Recruiters will promise you the world to get you in, because once your in and don't get what you were promised, your nowhere you can do anything about it. Also, anything you sign, make sure you keep a copy. My wife did this when she joined the Navy, and it saved her ass(recruiter changed some stuff on her paperwork before submitting it, but since she had the originals she had signed, they couldn't hit her up with falsifying documents). Also, ask as many questions as you can before you get to the paper-signing point. Even if you think it might be a stupid question, go ahead and ask it. That's the only way your going to get the full story. If you know any one in a service you are interested in(besides a recruiter), talk to them about any questions you have, and about military life in general. I would be glad to answer any specific questions you can come up with if you PM me with them. But I can only speak for the Navy, since that is where I have spent my career(11 years).
If you decide to enlist, understand that you will be doing the grunt work, the stuff no one else wants to do. This is what junior guys are for, to do the dirty work. I've seen plenty of junior sailors who got an attitude because they didn't understand why they were the ones working their butt off while their supervisors were doing other stuff.