how many hours is the travel from shanghai to yiwu

im going to yiwu and stay for about a month.are there apartment that i can rent or at least near yiwu.

but first i want to experience winter in china and want to visit shanghai and tour this mid january and stay for a few days. and find accomodation, apartment in yiwu so that i will be ready for my trip this march to yiwu.
questions:
1.how many hours is the travel form shanghai to yiwu?
2.how much is the esimate rent for one month in shanghai and in yiwu?
3.where can i get translator and how much to pay per day?
4. where do purchasers in yiwu mostly stay and where can i meet them.
5. What are the places that i should visit this january in shanghai or near it?tourist attractions [places to go and what to do?

thank you in advance :)
---i know most tourist will ask the same questions. Pls answer for the benefit of the many :) thank you :)