This DX8 (first generation) Guide and Templates for a Programming a Six Servo Sailplane provide everything you need. The concept is to import the SPM file into your radio and make the adjustments using the Guide. The SPM file contains typical default settings for a six-servo sailplane and with some minor tweaking may be ready to fly.

The bundle includes a 38 page guide and a Radian Pro specific SPM template, how to set the center of gravity, modifications to the mechanical systems and a brief discussion of the control systems and how to trim them.  

The following are some screen shots of the manual.  .