It is suggested 45 days before to get study permit else u need to show enough funds to show living expenses.And u cant work legally before ur classes start.
Documents -
All Academic Transcripts
Ielts
Photocopy of all docs
Immigration Letter(If Received if not mail to embassy,your details passport number, name ,dob.)
Copy of mail which u ll send
GIC
Medical Copy
Wire Transfer from college and bank(fees)
Offer Letter.
Passport Size Photographs(4-6)