my dev kit arived 2 days ago, I am also quite new with it.
I also had some problems at the beginning but now it works.
-I use the XCTU NextGen
-I changed some setings
--base radio :DH = SH of remote radio
DL= SL of remote radio
--remote radio DH=SH of base radio
DL=SH of base radio
-Jumper P8 set on the remote radio (powerd with the power supply)
-P8 open on the base radio
You need min. 1 meter between the radios if you set the Power Level (PL) to 1mW
I hope that will help