Programming an application using the NFC or RFID / Documentation?

Hello there. Maybe someone can Help me out, as i am completly lost! I wanted to programm a little application that reads the UID of a given Transponder ( mifare or 125Khz transponder selectable via a menu) and converts it to different Formats and then shows it. so far so good, the BoilerPlate example was a good start for creating a Menu and settings. but i cant find ANY documentation on how to acces the RFID or NFC functions. Also i still dont realy get the whole Scene,Helper,worker thing… im used to programm arduinos and simple c++ programms, so this isnt easy at all for me.

if someone could give me just a starting point, that would be great. many thanks in advance @_@