There are some very good answers here, but I will add this, I love the 60mm cutter, but the blades are real expensive and harder to get. I have always used the 45mm and can get blades for it cheaper than the 60mm. The rest of the questions are answered here very well. As far as fabric, when I started out, didn't have this board, so didn't have any help of any kind. This board is wonderful for coming to for help. Good luck with your journey.
Rita