When you do it NOT as a QAYG, one of it's names is lasagna. It's quite simple. Sew one strip down, either in the middle or at one end. if the strip is too long, cut off the excess to add to another. If it's short, sew 2 or more together. Add one strip after another until you have covered the area you wanted to cover, then bind it. I am not wild about it, but it is fast and as colorful as the scraps or jelly roll you use to make it.
As for yardage requirements, with a jelly roll, figure out the length and with of what you want to make. If the jelly roll pieces are 40" of usable fabric x 2.5", you will get 2" of finished quilt top per strip for a 40" wide quilt. If you want a 60" quilt, you will need 30 strips, plus binding. I suspect that is going to be 2-3 rolls.