Check out
www.newarchery.com for the tuning guide there. If you have any questions about the Quik Tune rests that the guide doesn't cover, then you can email their tech department. I own a Quik Tune 1000 and have done this twice and both times I have had a reply within 48 hours. Very good service, IMO.
Short answer: You just want enough tension on your rest to hold the arrow up at full draw.
Another tuning guide is available for download at
www.eastonarchery.com and it covers many topics. Also, Larry Wise has a few good books in print including
Tuning and Silencing Your Bowhunting Shooting System.
The Mouse