People will want to see schematics of the transmitter and receiver, and more details of the Arduino (Uno Nano etc.) and RF24 modules before they can help you.
There is a really usefully piece of code from @Robin2 here https://forum.arduino.cc/t/simple-nrf24l01-2-4ghz-transceiver-demo/405123/30
(answer 30) which allows you do a basic check independently on both NRF24L01s to make sure they are working.
Good luck.