You need to find a reputable school from which to take lessons. Sure there really is no law saying you need to take any lessons, but I would highly recommend doing so. Here in the northeast there are four schools to select from. Aside from lessons, you need some equipment. All of the schools above offer the use of their own equipment for training, but you really should consider purchasing your own once you decide that flying a hang glider is for you.
Gliders come in all shapes and sizes.
The best one for you is one you can fly easily and most importantly have tons of fun using. Instructors are the best persons to speak to when making a selection, especially those instructors who have been involved with the sport of hang gliding since its inception. And now the most important consideration, cost. No need to worry, you will never use it. I mean your skills and judgement will be at such a high level once done with proper lessons you will never put yourself, or glider, in any situation that would warrant its use.