Two very sensible questions, Paul!
For rebound, wind the adjuster fully in then count 16 clicks out.
The amount of preload in millimetres is the difference between the spring's free length and its length when fitted to the shock and fully extended. Look on the spring and there will be a four digit number. I think for the DU737, it should be 1092. That means the spring is 170mm long when not on the shock. So 12.5mm of preload will mean that it would measure 157.5mm when on the shock with no load (i.e. fully extended).
Hope that helps.
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