Get to know each school's rules and expectations as soon as possible . Keep notes on individual teacher's rules or copies of class rule sheets. Get to know the names of at least a few key students as soon as possible . Not every teacher will have time to leave detailed lessons and nothing spells disaster like a room full of students with nothing better to do than torture the sub. Dress neatly and professionally .
Kids love to pick on subs.
And, if you want to be considered for hire as a regular teacher, subbing provides a way to show administrators that you're a pro. That's a sure way to lose their respect. Stay away from anything even remotely sexy. This just isn't the place. Err on the side of conservative.