The first one has the correct capitilization.
30 minutes of the school day being spent working with the janitorial staff to help students develop respect and responsibility.
It's a run on. It is easy to fix.
Jackson is a very smart little boy. He can count to twenty and is only two years old.
Delete usual. Custom and usual do not flow together and a custom is already a usual thing, just like tradition.
A writer can express his/her theme through different techniques. Some examples would be word choice, tone, mood, and even characterization. I hope this helps.
