You can start by writing the sender and the receiver,
in the sender, you can print a dump of the packet that should be sent,
in the receiver, you can test the functionality by feeding in data or commands via serial.
Adding the NRF functionality to that setup is very easy and straightforward,
given that both sketches are non-blocking and delay free,
and the commands are less than 32 bytes long
(single packet interfaces are so much simpler...).
If you want to see examples for simple communications, Robin2's tutorial has
examples for most of the possible operation modes.
There are some RC applications to control devices also.