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your quest to interface to a USB drive is not too difficult, however you should have some basics in place;
- familiarity with at least some microcontroller.
- have programming resources at hand. Don't bother with assembly, this is C territory, implying a compiler and programmer to write to micro.
- PCB construction resources. This is not breadable.
You require a host capable device. I personally use the MAX3421 in conjunction with a Atmel 8051 based micros. The controller utilizes SPI, so your micro should have that function. I understand that one of the PICs has host capablility.
With your circuit assembled and tested, you will be ready to begin programming your routines. You will find a good number of routines online, of which you may only have to port them to your micro.
From there it's just a matter of talking the right language to your device.
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