This may not even be enough info to help at all, but I was in Tokyo last year for business, and you can get a train from the airport (Narita) right to Disney. The folks at the train ticket station were very helpful (I was going elsewhere but had to buy tickets). There were also buses that said “Disney Resort,” just like the way the WDW park buses do

I just googled it and disneyhotels.jp tell you exactly how to get there from either Narita or Haneda airport.
Also, I’m not sure about within the parks, but lots of places in Japan, even right in Tokyo, only take cash. Post offices and train stations were very good places to find international ATMs.
If any other general Japan travel info is of interest, I might be able to answer. My DD graduates high school this year and has asked to go to Tokyo Disney for college graduation, so I want to learn what I can before then too!