You'll probably want to take the TTC bus and then transfer to the monorail. You could also get there by taking the boat to MK and then getting on the monorail, but that would take longer since the boat is slow and the GF would be the last stop on the monorail, instead of the first.
I'm not sure about time since I can't remember if the TTC bus from WL goes to FW or WL first. I would probably allow about 45 minutes, just to be on the safe side.