Self solder 8-pin din cable
For the composite video, you need coaxial cable with characteristic impedance of 75 ohms. The shield of the coaxial cable should be enough to protect the signal from disturbances. The coaxial shield should be connected to the video signal ground pin, if there is a separate ground pin for video.

For the power supply, it is usually enough to use the cable you see on standard wall warts.