"Kelp Highway" is a common name for the theory, since it involves exploiting rich marine ecosystems while expanding down the coast relatively quickly.
"Pre Clovis Sites" should get you to the level of specific digs.
"Western stemmed points" are the most solid link back to the cultures in East Asia after the last glacial maximum. I believe the genetic data is not as clear on this yet but is coming together.
The Oregon Archaeological Society's YouTube channel has a number of professional lectures for amateur enthusiasts that touch on this - https://youtu.be/KPpgn-NVeLI?si=SCKpePUNp3pKyPSa i think this is the one with a lot of info on the evidence for links to cultures in Japan.