USB Mass Storage on LPC1768

Hi guys. I'm almost new to ARM and I'm working with some kind of lpc1768 eval board and uvision keil 5. I've run gpio, uart and pwm but i have problem with USB.

I want to put some data in a USB Mass Storage Flash in .txt file (such as LED1 = on, LED2 = off , etc) and set my board with these datas. after that make a .txt log file  from board status and save it in USB flash. I have read lpc1768 user manual USB topics (device,host,otg) but I didn't understand any thing!

could you please help me with these thing?

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