To develop a custom (Universal Serial Interface)USB device required a study from the device class, USB descriptor, device driver (required windows ddk). It is going to take you a great amount of time to make all things done.

So, what next? The simplest way is to get an USB to LPT cable (around RM20) on local market, and utilize the SPP port interface to send data to your device, this only require a few hours to figure out how to send data from your PC to your customs device or controller.
Sources:
How to communicate with USB-LPT cable with usbprint.sys(default driver for Windows XP)
SPP protocal
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