I coach a women's rugby collegiate team.
Get to work. Check email messages. Meet with players for individual skills work. Go to any meetings with superiors. Training with the team.
Our sport is not an American sport so it's helpful to read online coaching articles from other countries whose main sport is rugby. YouTube is a very good source.
Here's the first step for high school students
Rugby is not in all high schools. The first step might just be getting a team started. If team members have not played rugby, then it's finding a coach who can teach. You might be interested in actually playing to better learn the sport with goals of coaching in the future. I started out as a player and became the coach because I really loved the strategy of the sport.
"My father said, "You should become a computer person" because it was right on the cusp of computers really becoming a reality in our lives which meant there would be lots of jobs. I never really had noise I can remember from other people."