To to the U.S. Army's website (goarmy) and use the Locate A Recruiter button to contact a recruiter in your area. Set up a meeting. This is the best source of reliable information about enlisting with prior service.
You will definitely be deployed at some point. There are very few people who have not been overseas which is a little different than it used to be. Also expect long hours at work. The good deals we used to have for deploying are mostly gone.
The best source of information is the U.S. Army recruiter. If you go to the Army's website, there is a link where you can locate a recruiter near you and set up an appointment.