I have a 15 pin connector wire colors (red,blue,yellow,white,purple,gray,brown,orange,an d green) that I want to change to a usb connector (red,black,white,green).so I'm not sure what wire to connect to what. PLEASE HELP

Try this:
https://www.wikihow.com/Transform-Your-15-Pin-(Gameport)-Microsoft-Sidewinder-Precision-Pro-Into-a-USB-Joystick