What kind of soil is best when re-potting? Can one use just regular potting
soil? BRBR

No, bonsai do best in bonsai soil. There must be someone in Canada selling it.
In the absence of obtainable bonsai soil, I would use about 1/3 finely ground
pine or fir bark, 1/3 fired clay particles (like Turface), and 1/3 crushed
granite chicken grit, with 10% charcoal added.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)