Marina,
If no one has told you, it is very stressful right up to the point where your son decides to go or do. Just be honest and have a great attitude. Most of all, be sure to enjoy the ride before you know it he will be done with High School. This site has a large amount of information to help as a guideline. The forum people are a huge wealth of information and they will help you all the way throughout the process. You just need to ask the question