The supply list at the top is for ONE 20" block
First figure out how large you want your quilt to be (queen size plus how much overhang? Do you want a tuck under the pillow?). You can use this website to help figure out your quilt size
http://www.amishcountrylanes.com/Pages/QuiltSize.shtml
Ok ... say you want the finished quilt to be 96" X 110". That would be 5 blocks across and 6 blocks down for a total of 30 blocks (and will finish to 100 X 120).
Now you can multiple the supply list by 30 ... and I would include a fudge factor as well.
Honestly though ... you would be far better off buying a DWR book that has the whole pattern and clear instructions from start to finish. There is more than one method of making DWR ... suggest you look through each book and see which one appeals to you.