I hope you observed the fact the nRF24L01 is a 3.3v device and powered it off the 3v3 pin!
The pingpair example is a good one to start with. Easy to set up and get it going.
I second the other poster that the serial port speed would seem to be set wrong. If the nRF24L01 is not working right, you'll still typically see all zeros or all ones from the .printDetails() when it is called.
The first one I ever tried to wire up, I got mixed up about which way the pins were designated vis a vis the diagram I was referring to. Be sure you recheck that carefully.
On the plus side, I actually applied power to the wrong pins a couple times at the outset and the little buggers survived.