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The very informative web presence of the Yukon Beringia Interpretive Center, focusing on the story of Beringia.
http://instaar.colorado.edu/QGISL/bering_land_bridge/
A very cool animation of the change in the configuration of Beringia from 21,000 years ago when sea level was at its low point and the Land Bridge was at its maximum to the establishment of the modern coastline about 8,000 years ago.
Perhaps the best place online to find information about the earliest human settlement of the New World is the website of the Center for the Study of the First Americans. Click the link Who Were the First Americans (http://csfa.tamu.edu/who.php), for a terrific summary of the current archaeological thinking on the subject.
https://www.youtube.com/watch?v=OWYGaKSeCeo&feature=youtu.be
This episode (#5) of the series The Incredible Human Journey, presents a useful summary of the archaeological, geological, and genetic evidence for the earliest human settlement of the New World: