Wedding preparations - Need help!!

Hey!! I'm happy to announce that my marriage is on November 3rd. I want to look the best on this big day. I have started my preparations.
As a first step, I'm planning a smile makeover. Any thoughts?
 My teeth are slightly yellow in color and there are stains due to my smoking habits. I've been trying DIY tips like lemon juice, rubbing with orange peel, etc. to remove those stains. But there was no result. So I’m considering cosmetic dentistry services from a clinic in Mississauga. Can anyone suggest a good cosmetic procedure to get rid of the stains? I just want to know the exact cost of this procedure. One of my friends asked me to quit my smoking habit before considering any cosmetic procedure. Can anyone here share some tips to quit smoking? Any advice is highly appreciated. Thanks!!