I would suggest to start with an appropriate example from the SDK for your boards. SD card or FatFS examples should be appropriate.
I don't know both of your boards myself. But with an external SD card interface, there is likely some code to adapt, or to port. The lowest layer of this SD card /FatFS code is target specific. This is quite some task for a beginner.
The easiest route would be a board that comes with an SD card interface and slot, like my OM13098. The SDK example code for those usually works out of the box.