For the hood you gotta draw a pattern of a typical two-piece hood and alter the tip into a point. If you make the back part straight, you can erase the back seam by connecting the pieces on the fold of the fabric.
No worries. The hole near the shoulders is the sleeve opening and it will be cut into the bigger parts underneath the shorter parts. The x's show a measurement that is identical. For example, if the front of your cape (from shoulder to the bottom) is 1 meter long, the back will be one meter long, plus the funnily shaped bottom part. I hope this cleared things up, I'm bad at explaining.