The curious part of school ball is the relatively few games involved. There are about 100 to 120 games in a HS career. If you played travel from Age 9 to 14 there were probably 400+ games in that time. Your son may have the same number of games left in the next 4 years as he would have played in one year of travel ball.
You will find that every one of them matters because there are so few. Depending on the rules for making the State Playoffs winning the District can make or break a season. If you are in a tough district you cannot afford any bad games. It can be a pressure cooker.
If you want a great laugh go to the Golden Threads here and find the one about parents in the stands. It is about 12 pages and is a hoot. Even if you don't get them all now...you will. Enjoy every minute of it.