How do you start your ninjutsu training?

Go to google maps and look up Ninjustu lessons in wherever you live. For example, Ninjutsu lessons in Hatboro, PA. There may be a place that teaches ninjutu near you. Now if you want to learn real traditional ninjutsu, go to the Hunbo Dojo in Japan. You will learn for the Ninjutsu Grandmaster, Masaaki Hatsumi.