Every school is different so the protocols for when students arrive at the beginning of the day may be different. But for the most part students are expected to enter the room politely, they should put their backpack, coats, boots, gloves, hats, etc. should be put away either in their lockers or their cubbies. They should take with them to the classroom whatever supplies, classwork or homework they need. Depending on the teacher they might turn in their homework on the way to their seats, or they might head to their seats with the homework so that they can go over it together as a class. Students should be at their desk or wherever else they are expected to be, with their supplies and ready to go by the time the bell rings, the announcements start or when the teacher is ready to go.