There is a great instructional video for nunchucks at
www.nandargroup.com/Streetwise.htm that teaches you all the blocks, striking, dragging, hand spins etc.. It has a section on street fighting how to block and protect yourself. But he also, has a special edition on how to build custom made nunchucks to fit your build and hand size, which helps elimnate you injurying yourself with them. It also talks about the different cords vs nylon and chains. Check it out!