You need:
1. The completed application form (including your guarantor's details, signature, date, and place)
2. Your original certificate of citizenship (which will be scanned and returned to you in person)
3. Your original driver's licence (or Photo ID card), Health ID card, or foreign passport. (i.e. 2 pieces of ID for face/signature/DOB)
4. Two identical Canadian-passport photos taken within the last six months, one must have the photo studio's address/date taken and your guarantor must state this bears true resemblance to <your full name> and they must sign underneath. Second photo needs no special treatment.
You can check the official website and download a copy of the form (Google it) and double check yourself.
Answer 2) Yes, you pay more and you can get express.