Welcome Ponch:
Fence posts are placed at various spaces, 6', 8', 10'. In your case with the fence being so tall, I would go with 6' and I would use galvanized screws rather than nails. Nails are subject to loosen up over the years of exposure and vibration from the wind.
I also think you should check with the local authorities for a permit to build the fence; they sometimes get rather testy about their rules.
Glenn
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