I had no idea that there is a feature called Research Wiki on FamilySearch.org. It looks like there is some good starter information there, and I am excited to read up a bit more and see what I can find there. Here's a link to the article on getting started with Japanese research:
https://www.familysearch.org/learn/wiki/en/Japan
There is also a research forum for Asian family history research where you can ask questions and see if anyone can help with your questions:
https://familysearch.org/learn/forums/en/forumdisplay.php?f=7?cid=wiki-forum
And, in keeping with the times, there is a Facebook page for Japanese research.
https://www.facebook.com/JapanGenealogyResearch?fref=ts