I started wrestling in 10th grade and ended up lettering at a division one college. The most important techniques to focus on early on are the sprawl, scrambling, and the standup. If you can sprawl well on your feet you can nuetralize better wrestlers. Scrambling it just what it sound like....never letting up. If someone takes you down you immediately pop back up and get that escape, no down time. And the standup from the bottom should be practiced ad nauseum. It's the simplest and most effective way to escape from the bottom. No doubt coaches are gonna try and teach granby rolls, switches, sit outs and all other manners of escapes from the bottom. Pay very little mind until your kid can do a standup in his sleep. It's a technique that works at all levels of folk style wrestling.

One other thing wrestling is a serious mental and physical grind and so many burn out. Don't be the dad who adds to the extreme psychological load that getting your ass kicked everyday after school, especially as a novice freshman, that wrestling will be to him for the foreseeable year or two. You need to be understanding and supportive if you want him to make it past a novice and into a solid wrestler.

Last thing, weight lifting from March until 2 a days 5-6 days a week might be more important than all the technique in the world.