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help for first steps to create a WSN

hello,
I am engineering student and I am new to this community.
I'm just working on a project to implement a ZigBee wireless sensor network for outdoor use.
The network should be created on a stretch of beach about 2 miles of length.
Each sensor is positioned at a distance of about 50 meters from the previous node.
Can you give me a suggestion for a just and secure solution?


thanks