Take a short piece of the crown molding and paper and pencil. Lay out the space inside of the molding using the framing square to simulate the wall and ceiling. Use a protractor to measure the angle between the "wall" leg of the framing square and the crown molding. This is called the spring angle.
Also lay out the face side of the crown molding. There are so many different variations that you could have with the vertical molding that it's impossible to be too specific but you should be able to work with the drawing and the spring angle to plan cuts with your miter saw and coping saw to get a good fit. You will want to work out how to go about this using a short piece of molding before you try it on the long piece you plan to use.
One other comment is that you will want to use a cope joint where two walls meet at an inside corner. Another side note is that 2 home improvement or woodworking magazines have articles out now on installing crown molding and you might want to check this out.
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