Hi Melvin. For what it's worth, I have never used graph paper. I draw everything to a 1/2 inch = 1 foot scale, beginning with the overall dimensions of the train table. For my particular needs, I use carefully chosen bottle caps and jar lids. My 0-72 curve is a Hellmanns mayonnaise jar lid that makes a curve that's correct to the scale I mentioned (a complete circle is an exact 3 inches in diameter, or 72 'scale' inches.
For smaller curves, I use the same formula. You can laugh, but it works for me and I've had a lot of fun making up various track plans. Of course I use a ruler and a pink eraser with the 'sharp' ends for fine work. A freshly sharpened pencil also. Using the ruler, each 1/8 inch represents 3 scale inches on the drawing, and so on. Just make sure your caps and lids are the exact size you need to make accurate plans.Of course, to represent a switch, I use a short section of straight line with the appropriate curve branching off. I use blank computer paper always. Anyway, good luck with whatever method you use!
Hoppy