To help you learn, some things to play with …
The first is the CameraSim. Set this to the Manual mode and then you can try adjusting the ISO, aperture and shutter to see what effects each has.
The second simulator comes to us from Canon of Canada, complete with a little exposure meter.
Give each of these a try and see how it feels.
To get you ready for next Wednesday, you should take a look at the manual for the camera. Sections 1, 2, 3, 4 and 7 will be very helpful. Some of those will be talking about automatic modes and things we won’t use, but mixed in is information that you do need – and that which you won’t need right away, you should be aware of.