What is the most logical next event?

How to create contour lines using sketchup
Click on the add imagery icon.
Go to wherever you want to get your contours from in the screen that comes up.
Draw a rectangle that is the size of the contours that you are creating.

OPT: a). Click on the move tool and holding down ctrl and make a copy and make sure it is directly above the previous layer. Type in the number that you want for contour lines.. b). You want your curves to run horizontally, and not vertical. Back away from the rectangle, if you can.. c). Finish the rectangle with a line bigger or smaller than the contours that you are making. Go back to the image that you just created and you will see that it is now the outline of what you have drawn with your brush.. d). Add lines inside of the rectangle. Each part of the rectangle needs to be about 1.05x1 centimeter for contour lines..
a).