I manage filming schedules and logistics on large movie productions.
Most days start with meeting up with the Directors and crew to discuss the day's activities. This can be anything from reviewing footage, scouting locations, arranging permits, to actual filming with crew on location. Every day is different, and sometimes can be very hectic, but it's always interesting.
One of the most useful experiences is to get an internship or start assisting on set as soon as possible. This is how to find out if you really enjoy working on a film set. It's a lot of hard work, but the hand's on experience is very important.
Here's the first step for middle school students
If you want to get into film, I would recommend reading as much as possible. Not just about film, but everything from history to literature. You can always learn about cameras and technology, but what people don't realize is that film making is about story telling.
"You should become an accountant because you need to make money."