Hello Lily, Welcome to Canada and welcome to ROLIA.com!
You don't need to bring the following:
They're cheaper here.
Also don't bring these:
PC Computer; :)
220V Electronics ;
I believe you can rent a cheaper apartment than the HOMESTAY. At the beginning, you may have to live in the homestay for a short period, because you may don't have chance to rent a room off-campus while you are in China. After you come you may find and rent a cheaper room.