This video will help you maneuver around the campaign map effectively.
To move the camera about the campaign map, use the WASD keys or hold the middle mouse button and drag. You can select armies and settlements by left clicking and order selected armies to move or attack by right-clicking the destination or target.
To zoom in or out, scroll the mousewheel up and down, or by using the Z and X keys. If you scroll out far enough the strategic map will be displayed, showing the areas you have discovered. You can also rotate the camera with the Q and E keys.
When in the army or province overview panels, you can also click on the army or settlement to move your camera over to their location.
Lastly, press escape to access the game options, where you are able to save and load games, as well as access the options.