The pattern is available in Dutch and English!

You can use all kind of yarns. The size of the punkie depends on yarn and hooksize.
Use a hooksize that is about one smaller then recommended for the yarn you use. Your crocheting must be tight otherwise you will see the stuffing through little holes.
For the punkie in the picture I used a 20% polyamid/ 80% acrylic yarn; 50 g approx. 190 m and a steel crochet hook 2.0 mm. The punkie is 5 cm (2 inch) tall.