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Flashing LED usb Answered

I'm not really sure where to start with this, but in the end I's like an LED strobe where I can control how fast is flashes precisely (for example 5khz). My Ideas so far is you have an LED hooked up to my laptop via usb with a simple program to control the speed and how many times it flashes. Right now I've got LED's and usb's and 100ohm resisters if i need them. From what I've read I don't think I can control the usb port's power so I'm assuming I need a driver board or something? I'd love some help with this but I assume I've been too vague, mostly because I'm not sure what i'm talking about. Any help I can get would be amazing. Thanks