Try searching that on Youtube, there are many J-vloggers on there that answer those questions all of the time.

Unrested has a JFAQ series and gimmeabreakman also has some informative videos. Theres a lot of dos and donts lists, but youd have to be more specific on this because there are too many answers. Try something like "Dos and donts... in a conversation", or clothing, housing/home related, eating food, being on the train, and so forth. Theres just too many things