Thinking about going to the national guard what should I do
Realize that chances are ... you WILL be deployed overseas for combat, as we rely more on the National Guard for extended land warfare, than on the standing/"regular" military. If you're okay with that ... go ahead and join.
That is a question to sit down and discuss with your family.
You have to be 18 years of age or 17 with parental consent. If you are going to join any branch of military you need to be physically fit and prepared, nothing is harder than boot camp if you show up unprepared. Good luck
I liked glenjy's answer, join the Marines (or the army or whatever makes you happy), nowadays they deploy most of the national guard guys anyways so you might as well.