Haha! Me, too! I was told the wrong orientation date by the HR lady, so I was never briefed on the payroll/PTO/benefits side of things (actually, she told me it was for teachers so I "didn't need to worry about it"... smh). As for the actual duties of the SN - I emailed my local SN professional organization with a list of questions and started googling the state regulations/requirements. I had long conversations with Dept of Edu and Dept of Health Nurse liaisons, posted a BUNCH on here, and basically figured it out myself.
This weekend, I am going to a one-day SN conference particular to my state, and they hold a two-day conference closer to the start of school. It's out of my price range, but if I would have known about it last year it would have absolutely been worth the $$$ (I have to pay for my own conferences). If you can find something like that local to you, I'd highly recommend it. You can also get contacts from colleagues that you can call upon later when you have questions!