I am IT engineer but i am trying to design device which make device to device communication using usb. through this device i perform money transaction. but i dont know anythig about the electronics and i am new to microcontroller so please help me.
So you obviously need to spend some time learning about electronics & microcontrollers!
In fact, that is likely to take a considerable time - so you might be better taking Per's advice and "outsourcing" this part of the task. I'm sure there will still be plenty of "IT" content in the project to keep you busy in your key competence...