1. There are two ways to get from Haneda Airport to Tokyo Station first.
A, choose to ride? モノレール (Tokyo Monorail) departs from Haneda Airport International to Hamamatsu-CHO, and then from Hamamatsu-CHO to Tokyo, and transfers once. At Hamamatsu-CHO Station, transfer to JR East Japan Tramwork Line to Tokyo Station, and take the cross-Shinkansen from Tokyo.
b？ Choose to take the Keihin Express Tram (Keihin Tram), depart from Haneda Airport International to Shinagawa, and then from Shinagawa to Tokyo, and change once. At Shinagawa Station, transfer to JR East Japan Tram Yamanote Line to Tokyo Station, and take Shinkansen from Tokyo.
c？ As far as the fare is concerned, Beijing Express is cheap (550 yen for Beijing Express to Tokyo Station and 620 yen for Tokyo).
2.？ The relevant stations have conspicuous signs (Chinese, Japanese, English and Korean), so don't worry about finding the north. If you are really worried, you can write Chinese characters on paper: keywords such as Tokyo and Shanghai-Vietnam Shinkansen.
I hope it helps you. ? Attached is a photo of the airport building.