to be honest your best bet would be to email transport canada directly. I suggest the regional office in the province you want to do your training in. It should not cost to much to convert about 2500 pounds. All of this is tax deductable if/when you start working in Canada. I doubt you will have to do the p-star exam however if you dont it will be the air law exam. Its a lower pass mark, so dont worry. You will have to do the multi ir ride. It is easier than the U.K ride, dependant on the examiner of course. you will have to do a class 1 medical too. I would be surprised if there is any set training to do, (I've never been involved with a cpl conversion before). Again the regional department would advise you on this.
I would advise you to look into the job prospects though as you will be surprised at how low the wages are in Canada.