Hi, from Bangladesh to Wenling, you need to transfer at Guangzhou Airport. The route should be Dhaka->Guangzhou of Guangdong Province (by air)->Hangzhou Airport of Zhejiang (by air)->Wenling (by bus)

From Wenling to Zhuji, both of the two cities don't have airport, so you have to take a bus from Wenling.

Zhuji is about 300 kilometers to Zhangjiagang, so please get to Hangzhou by bus firstly and then take coaches from Hangzhou North Bus Station to Zhangjiagang. The Zhuji Bus Station has frequent buses to Hangzhou South Bus Station from 06:30 to 16:30.

From Zhangjiagang to Changzhou, the Zhangjiagang Bus Station has frequent coaches to Changzhou from 06:00 to 18:00 everyday. The journey is just 1.5 hours and costs 26RMB.