You will need: G-6 (4.00mm) hook (4) Medium yarn- about 250 yards. I used Lion Brand Glitterspun in Ruby.
Stitches you need to know: single crochet double crochet triple crochet
The instructions are for the cowl pictured but you can customize it. Add stitches to make it wider, add rows to make it longer. You can leave it as a scarf, sew the ends together to make a circle scarf or twist and sew the ends together to make an infinity scarf.