USB controller

I want to program USBN 9604 to interface PIC16Fxx with USB by using SPI.. I dont know how to start... ? How will I start that programm.. If anybody have the solution or algoritham or sample programme of this, plz help me... Plz...

Sounds like it might be over your head. Try a simpler FT232R to the PIC USART or a USB enabled PIC like the popular 18F4550