Being able to draw out what your thinking has been very important for both inventors and engineers. While the process to make an orthographic projections seems to be just drawing, it also involves accuracy and scaling to other objects.
before you begin with drawing and Ortho Projection you must consider the object you want to make
imagine the object you want inside a glass box. the sides of the box would be your different views of the object, above the glass box would be your top, side of the box would be your side view etc.