So, will you find a place to stay when you get to each city around Shanghai? For a meium class hotel, I think 300RMB per night is enough. Hanting Express Hotel or Motel 167 are all fine. You can think about them. The fare should be within 300RMB per night. You can take bus from Shanghai South Bus Station next to the south railway station to Ningbo, about three hours. The bus fare is 100RMB. You can take bullet train to Suzhou (half a hour) and Hangzhou (1.5 hours). Train details can be found here:
https://www.travelchinaguide.com/china-trains/
You can get to Suzhou or Hangzhou first and then take bus (two hours) to the other. Then back to Shanghai by bullet train.
Yes, you need to pay in RMB. You had better arrive in the airport two hours earlier, three hours ealier from Shanghai South Railway Station. There is Airport Bus Line 7 from the south square of Shanghai South Railway Station to pudong airport.