Do I need to do anything before rotating the first time?

Right click on the Magick Rotation icon (green arrow), located in the notification area in the top panel (right side), and chose 'Setup'. Chose if you want Magick to "Run on start?" (you do) and which direction to rotate to. Remember to 'Save' the direction if you changed it. Then go into "Advanced Setup" and make any other changes you want (commands to run before and after rotation, etc.) and then click on 'Save'. You are ready to rotate.