It depends if you want to emigrate or work temporarily. I have done the temporary foreign worker thing and the permanent residence thing. For the temporary worker thing you have to prove that your employer can't find a Canadian for a decent wage who will do the job. I was applying to work weekend nights in a really dodgy homeless shelter and it still took ages, and I finally got the local politician involved.
I can't help with the immigration process, but if you find you need to retrain to be a TA, Langara college at Cambie and 49th has the best program. But daycare is very expensive. You would be paying a minimum of $1000 per child per month, it would be cheaper for you to get a nanny. No way would a TA ( called EA - education assistant in Van) salary cover that.
Many careers in Canada require local certification. It is a huge problem for many people who don't realize that before they arrive.
Vancouver is amazing if you can get past the rain, and the cost.