1. You have to get the notarized documents of your wife:
Birth certificate, No Criminal certificate, and Marriage certificate.
(It is better to get your wife's "HU KOU" also notarized.
2. Get the photocopie of your wife's passport (the first page that has the photo).
3. There is no job or income requirement for you to sponsor your wife. (This is different from sponsoing your parents).
4. After you come back, you can apply then.
You can refer to IMM3903e.pdf for details about how you should prepare the documents for your wift.