Build a Communication using 2 nrf24l01 i need them to communicate with each other 2 start my mpu6050

I need my nrf24l01 to communicate with each other when a button is push send arduino start and stop code but i need also a conformation letting the devices know they have received orders from each other and they have been executed.. when its excuted i need a script that uses my mpu6050 to act as a motion detector and when it goes off sends message to user nrf24l01 to alert that motion has been detected i have already written code but it still needs to be polished up it runs constantly and i dont want it to run constantly...