This pattern includes instructions and photographs showing how to make the squares and haw to join them together. It also includes a detailed chart with information on haw many yards of each yarn you will need for blankets from preemie to king sized.

In general:
Preemie - 620 yards
Baby - 1,090 yards
Twin - 7,460 yards
Double - 8,370 yards
Queen - 10,070 yards
King - 12,740 yards