This is a yarn-eating pattern. I would suggest buying 5 oz to 7 oz of yarn to make one pouf.
There is a written pattern, alongside a photo tutorial.
Depending on how dense you would like your puff to be, you can change your hook size. I used a 6.5 mm hook for one of them, which made it very loose, then used a 5.5 mm hook for the other poufs that I made, which created a tighter stitched pouf.