Robin, don't be intimidated! Sketches are just kind of guidelines for the layout - you use whatever colors/patterns/embellishments etc you want, generally arranged as per the sketch. The different shades/shapes etc. are just for differentiation - so if a sketch shows a big flower, YOUR interpretation could be something else in that spot! Some folks follow the sketches exactly, some use them as a starting point for their creation and often the end result is a bit different. We just want you to join in and have fun!
Thoughts become things....choose the good ones.