1.) OK
2.) it is recommended, to prevent squeaks associated with wood to wood and minute, movement, also a small moisture resistance, if you use 15-lb asphalt impregnated felt, as a fancy name for roofing felt.
You can use rosin paper, or even newspaper, if you don't need a little reasurance.
3.) Yes, Every piece / board. Depending on the manufacturer, most recommend every 6-8 inches and no closer then 2 inches from the ends, to keep from splitting the tongue.
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