If you're asking about internal wires, pinout.ru gives you all the knowledge you need. Look at the bottom of
this page to see how long you can have your cable given the gauge of the internal wires.
Also, since USB is a differential signal, data lines should be close, twisting the data wires (green and white ones) all the cable long is a good way to do that.
Finally, stick to the standard colours for wires.
