What you have to do before joining the marines?

To start off, I served in Iraq for the USMC for 15 years to start off make sure you are in great shape make sure you can run and be sure to be on a healthy diet. Before enlisting in service make sure its what you want to do. You can enlist at 17 with your parents permission. when you walk into the office of a recruiter ask him Questions you want to know take it from there. Thanks!