Hello Dear,
Please download & read the instruction guide for this. Everything is clearly mentioned. Any nationalized bank can get you the Bank Draft in Canadian Dollars. Check it with State Bank branches or HDFC or ICICI or PNB etc.. near to your locality. Do not forget to take a print copy of the 'Fee Payment Form' & your Passport - this is just for the validation purpose, if they ask!
Instruction guide Step-3 &$ Step-4 describes everything about Fee Payment Information & Where to mail your application.
You need to send your application pkg to CIC, NS, Canada.
Hope this helps!
Cheers,
Shadab
thanx dear