first day of orientatation tomorrow..what to expect??

so, after 2years exactly i got my RN license, i finally land a job in a nursing home, i will be working in short-term rehab unit... orientation starts tomorrow in the floor because they somehow misplaced my documents so i missed the classroom orientation part which was on wednesday and i got called on thursday to finalize... so the question is what are they expecting of me on my first day...am really nervous///any suggestions would be greatly appreciated..and also which shift is less stressful aside from the 11-7?? thank u!
First off - Congratulations!Second - breathe - you know what you're doing and if you feel like you don't, ask for help. Expect to be briefed on how where you work, well, works. I've had the fortune of working with preceptors who are very understanding of the learning curve. No one is going to expect you to know how everything works at the facility, but I imagine you'll be expected to make an effort to learn and not use being new as an excuse. Good luck!