There isn't direct trian or bus from Yiwu to Wuzhen, you have to get to Hangzhou(https://www.travelchinaguide.com/cityguides/hangzhou.htm) or Jiaxing(https://www.travelchinaguide.com/cityguides/zhejiang/jiaxing/), and then take a bus to Wuzhen. To Thousand Islets Lake(https://www.travelchinaguide.com/attraction/zhejiang/hangzhou/qiandaohu.htm), you may either take a bus from Yiwu nanfang passenger station or take a train from Yiwu Railway station.