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.
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.