The beginning of the year is always a little crazy for all teachers. Getting your room setup, implementing new ideas into your lesson plans, getting to know your students, and just settling back in to the routine can be busy and stressful. Remember to not over do it and take time for yourself.
One thing I've done in the past that helped me is using a check list of everything I have to do when school starts, including setting up my room (computer, bulletin boards, etc), things I want to post in my room, lesson ideas and more in Evernote. I modify it each year, adding new things for the following year.
Here are some more tips, resources, and help to get your school year started on a positive note, and keep it that way.
Evernote for Education Resources - the ultimate note taking, web clipping, lesson planning resource
Create a Personal Learning Network - a PLN is an excellent resource for help, advice, and sharing ideas.
Google for Educators - Google has a huge number of free resources for teachers and students. Check them all out (they're all free).
Overview of some free technology that can help you be more organized and efficient.
Good luck and I hope everyone has a great school year!!