Highlandman:
In Alberta the company to contact is Airspray limited in Red Deer.
In B.C. it is Conair in Abbotsford.
There are no schools for firebombing.
You generally start as a first officer on bombers or as a Bird Dog Pilot.
It is a four month a year job in B.C. and three months in Alberta.
The pay is different depending who you work for but will be between approximately thirty thousand dollars Canadian and up to around sixty five thousand per year working for a Government, such as Ontario.
What I suggest you do is contact the companies and inquire.
I may be a little wrong on the pay as I have not been in the business since 1986.