Where can I get a bus to Qidong near Shanghai longyang road. Also how much would a taxi be?

You can take the subway line 2 and get off at Century Avenue, and then transfer to line 4 and get off at SH Railway Station, about 550 meters from the SH Long-distance Bus Station. At that bus station, you can take the bus to Qidong.

If you hire a taxi, it may cost CNY 500. I suggest you take the long distance bus, there are more than 40 buses available every day, and the bus fare is CNY58, very cheap.