If this is your first trip to Calabogie, don't go out in the Yellow group first thing (they may not let you and require that you do the intro course first).
It's a long track with a lot of corners, a bunch of blind corners that look the same first time out. It's easy to get lost as to where you are on the track and setup for a corner that turns opposite to what you're expecting. There are little signs that tell you which way the corner goes but if you're moving at any pace, it's too late when you see the sign. There are lots of wanna be fast guys in Yellow and it can be a bit tricky if you need to check-up because the corner isn't what you expected.
Do a few sessions in green till you're comfortable that you know the track. If you're at all quick, it's easy to pass the first time riders coming off a corner onto a straight.
Don't worry a lot about gearing. (16/45 is stock?) Breaking and turn in points are probably more important than perfect gear ratios and shift points.