Talk about your qualifications and if you are ready to work as soon as you land, if not what steps you are taking to ensure you will be able to work.
Talk about who you know in Canada, what employers you have been in contact with and what type of jobs you are interested in.
Tell them about any relatives you have in Canada and about how long they have been there and what they are going to do for you when you arrive.
Talk about your job prospects and whether there is a shortage of people with your skill sets and any evidence you have of the province that you are moving to is advertising for people like you. How long you think it will take you to get a job? do you know anyone from your country with the same skill sets that has successfully settled.
Talk about your housing needs and what you have done to ensure you have a roof over your head when you arrive and that you have people to help you settle.
Really stress the point that you will make an immediate economic contribution to the Canadian economy and why do you think you will, taxes, bringing new skills, new cultures etc.
You just have to sell your self and show that you have done lots of research on your profession, place you intend to live, housing, jobs & family.