Does he need some help on the pronunciation?
Taking Tokaido Sanyo Shinkansen is very easy to foreigners.
Please download smartEX App from Google Play store or Apple Store.
For iPhone users, you can now buy a virtual Suica with Apple pay. You should register an account in smartEX App with your credit card and Suica. Then, you can just use your iPhone to book the ticket and take the Shinkansen with your virtual Suica.
For Android users, you should buy an IC card through the self-service kiosk at all JR train station. You can register an account in smartEX App with your credit card and IC card. Then, you can just use your Android phone to book the ticket and take the Shinkansen with your IC card.
If you take the Shinkansen with your family members or friends, you can use self-service kiosk at Shinkansen stations to pick up the tickets. Please insert your credit card and type the 4-digits pin. For Hong Kongers, you should type 1234 to pass the procedure (example from using HSBC credit card).