Cardboard (buckram or light plastic, like a thoroughly-cleaned bleach or carpet-cleaner bottle, will also work), wire for ears, needle and waxed thread for handsewing, cable ties (and assembled "whiskers" on anchor tie, self-explanatory), pattern template, and both fabric AND paper scissors (ask any stitcher how much he/she likes having sewing scissors abused by paper!).
Different hat or hood shapes will have different templates - this hat was made by an earwarmer-style band and a four-gore corwn. The traced piece is one of the four gores.
There is no need to worry about ear placement yet as you will be able to use the lining to determine placement.