*Keep a small basket filled with pencils, tape, a stapler and scissors in several places around the room. It saves many steps during the day.
*Teach students class signals the first week of class. Practice many times during the first week to reinforce (I have used a bell, the ringer of a timer, lights flickering, counting backwards from 10 etc., successfully.)
*Place a hook near your door for an "emergency" bag to take to the playground. I put first aid supplies small package of wipes, forms for a nurse visit and a pencil in mine. Assign one student a day to be in charge of taking the bag outside. (They never forget their jobs!) They hand it to you before being dismissed to play.
*Set out a tray or bin for students to place homework in a the beginning of the day.
*Designate a place for lunchboxes to be kept until lunch.
*Familiarize students as to where extra supplies are kept in the room, if needed. Establish rules for getting them without disturbing others.
*Set expectations for times to use the bathrooms, get water, wash hands, etc.
Set up your classroom in a way that works for YOU and YOUR STUDENTS. The goal is to have seamless transitions throughout the day.