1.1 You'll need:
-sewing thread (and a sewing machine)
-scissors (or other sharp object)
-fleece in 2 coordinating colours
-temporary spray adhesive
-some sort of measuring implement
-an embroidery hoop. Oh, and an embroidery machine. But if you're lacking in that department, you could also use hand embroidery or applique.
1.2 You'll also want some awesome monster embroidery files. Not sure where to find some? I suggest Monster Factory Design Pack
by Urban Threads
. I spend far too much money on that site, but their designs are just sooo good.