How do I set a camera to orthographic and point it facing Z?
Select your camera in the editor. In the inspector you should find "Projection". Set it to "Orthographic". Then it's a simple matter of setting rotation on that transform to (0, 0, 0).
If you have the camera parented to something else that have a rotation, you need to fix that. A simple way to do that is to drag your camera out temporarily so it has no parents. Now set its rotation to 0, 0, 0. Once this is done place it back at its parent.