For you to start your pattern, they will usually nod to you, or sometimes motion with their hand. To dismiss you from the inspection, they will say something like thank you, you are excused, or proceed to the line-up. If you are required to do something on the pattern after the inspection, look back and nod at the judge as you are completing your pattern. Also, just make sure to pay atttention to the directions you are given from either the judge or ring steward. Best of luck!