Let's get started! First I do some sketches, then imported them into Maya as image plane.

This is how it looks in perspective view where I align the front and side head together.

Then I use EP curve tool to draw guidelines in front, side and top view. Next I create a layer name it as guide and assign curves to it. Not to worry how many Edit Point the curve should have. It is only a guideline for my model. Then I create another layer name it as View and assign image planes to it, so that I can turn on/ of its visibility.