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For someone just starting with this camera I would recommend using Gain 139 Offset 20 (the Unity setting). This gives you a good compromise setting that can produce good images and allow you to explore the camera operation and abilities. As the camera can operate in many different modes, from planetary video, right through to DSO narrowband, there will be different configurations for what your setting up to achieve. There have been a fair number of people exploring high gain settings to do 'fast narrowband' or quick DSO imaging in RGB where you might not have enough time or good weather for convential imaging approaches. For high dynamic range you want to use the setting level described by Shiraz, say Gain 70, I believe the max pixel well-depth actually occurs at Gain 76 - based on work done by testers on Cloudy Nights. So keep it simple to start with, and take the time to read through the Beta Test thread on Cloudy Nights, and the original ASi1600 thread here on IIS, as these threads cover just about all aspects of camera use and capability.
Have fun.
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