To determine which datarefs to choose, use the DatarefTool. Please note that some datarefs are used exclusively by certain aircraft.
Dataref types are either Int (integer), Float, Double, FloatArray (an array containing several data of type Float), IntArray (an array of type Int) or Data (containing one to many characters).
From DatarefTool, click once on a dataref from the list, then click on the "copy name" button. This will copy the name to the clipboard.
If you copy a FloatArray or IntArray dataref, don't forget to include its index number, otherwise it won't work in the plugin.