Because I did a lot of garment construction, I'm a big fan of a cutting diagram. Clothing patterns show how to layout the pieces for the best use of your fabric. I would draw up a diagram of the fabric, and cutting lines, and number the lines in the order they should be cut. As far as yardage, I would figure out the exact amount needed, add 2 inches for squaring, then round up to the next 1/8 yard. Also, for smaller amounts, I would indicate if a FQ would work instead of a yardage cut.