How long does it take to walk from near Bullcreek Dr to the train station?

It depends which end really; but google maps can tell you exactly from where you are. The 879 and 779 buses go down Bull Creek Dr very frequently and take 2-4 minutes to arrive at the station from anywhere on BC Drive.

It depends on which part/street you are living. The near by train stations are Bull Creek and Murdoch.
The train stations have big parking space.