The Bujinkan is an old system with roots deep in Japan's history. Today, Bujinkan Budo Taijutsu is practiced around the world under various master teachers and in various schools, headed by Soke Hatsumi who was taught by Takamatsu Sensei.
There are teachers worldwide who can pass this art on to you if you have the will and the tenacity to stick with it. If possible, you should also consider training in Japan.
Training involves learning rolls, breakfalls, locks and strikes. It also involves learning both armed and unarmed combat. As with other arts, it also involves learning various kamae and kata.