Received my first sub assignment

Yesterday afternoon I received a call from the substitute coordinator asking if I can work this Friday.  Thankfully I'm available.  I will be at the junior/senior high school in the library.  Considering how nervous I am about getting back into the classroom, this is a perfect way to ease into things.  My first two jobs were in libraries.  I worked at the public library for almost two years followed by the library at college.  Over the last two years I have volunteered at the elementary school's library, so I'm familiar with the school district's computer system.  I'll also have the librarian's assistant there to help me out. 

I'm trying to figure out what I need to bring with me.  I have the bag I earned from last year's ADA walk that I've started putting things into in preparation.  I have a few magazines, a story book for when I sub at the younger levels, a folder with the junior and senior high class period schedule, power cord for my cell phone, pen, notebook, and of course my glucometer.  I should probably pack a few snacks in the bag separate from my lunch.  This is the first full-day job that I will have since being diagnosed with diabetes.  My other job is part-time and is only 2-3 hours at a time. 

For those of you who work full-time, what do you make sure to bring with you to work?  Thankfully I don't have to worry about medications or insulin at this time.  I'm probably over-thinking this, which is typical for me.  After having children at home for the last 17 years, this new phase in my life is exciting and terrifying at the same time.