Pete
What part of it are you having trouble with? Bind to a default Heli model.Go to System Setup/Fmode Setup and choose your FMode and Hold switches.If you are planning to go inverted then change your throttle curve so it looks like a V in FM1-2 instead of a linear one from 0-100.Change it to 100-50-100 In FM1.Or make it be a flat 100 all the way across.Go fly.
Most of it isnt really DX18 specific. Look here...
http://www.helifreak.com/showthread.php?t=41692
Watch the CCPM vids and the ones about throttle and pitch curves.If there is something specific you dont understand
ask more questions.Feel free to PM me if you want.Ill see it faster maybe if you PM me on HF.