I agree. Setting boundaries is extremely important. Knowing your limits and being aware of what you can do. Setting priorities to help stay focused will guide your actions. Also, keep the first couple of years simple. Many times it can be overwhelming looking next door. Focus on the students first. As you become more comfortable then add to your repertoire. It is a long process and can end in burnout if you try to put too much on your plate.
Read and answer your inbox each day before leaving. A lot of emails contain information, school tasks, parent requests, etc. and can pile up quickly. Even reading through all of your emails daily can keep you up to date with school and classroom information.
However, my advice for parent emails is to not answer immediately. Allow yourself time to think through their questions/ concerns and craft a reponse, or give yourself time to have a teacher friend read your response for a different perspective. Just like the other responses, not responding immediately sets a boundary for yourself that you will communicate in a timely manner but you are not on call 24 hours a day.
You cannot do it all. Definitely set time limits and boundaries for yourself. Give yourself plenty of grace because it’s a learning curve (and one I’m still on in year 14). I would set an hour timer and see how much I can get done in that time. Rely on experienced teachers to show you ways to make things easier and/or faster.