Learn How to Use Nunchucks
Even though it is always easier to visit classes run with a qualified instructor for any kind of fighting techinques technique, finding out how to make use of the nunchucks from books, DVDs, and even videos (there are thousands on YouTube) is really much easier than most fighting techinques techniques. This is because when you're learning the nunchucks it is all about drills and 'forms' that you simply perform by yourself, and in contrast to self defense techniques these drills are what its all about, so you don't have to practice with a partner or be able to learn how to rely on them inside a high stress street fighting situation, as that is not what learning the nunhcucks is about.
The nunchucks are all about speed, and also the hardest thing is making the grabs reliably. This means that even when you have discovered a drill or technique you should still keep practicing it over and over again often to build up the rate that you can do it at and to improve your skill to the level in which you never miss.
Because you will be swinging ammunition around your body at high-speed with full control at first you should never ever use a real wood or metal group of nunchucks for learning with. You should always obtain a soft padded foam practice set to make use of, otherwise I guarantee that you will do yourself a personal injury when you hit yourself on the top or in the groin at high speed.
At an advanced level you would take some of the things that you've learned with one weapon, and perform them with one in each hand. It's also wise to go beyond set forms to become more creative.