New LPN/Nursing student in need of career venting

Hello, I am a brand new LPN going back for my RN in the fall. I recently began a job as a per diem nurse at a nursing home. I've never worked in the healthcare field, not even as a CNA. I'm having some difficulties being on my own taking care of an 18 bed alzheimer's unit. I feel like I don't know anything and I'm afraid I'll screw up what I've been working so hard to attain. There are lots of times I get an admit or something involving lots of paperwork such as resident to resident altercations and I have a problem getting help from administration on what I need to do. Last Friday I got an outside admit to our unit and was never even told about it until the LSW and resident were at the door wanting in. By the time I was done with an initial assessment and talking with the LSW, I realized there were no doctor's orders for a transfer or for the new resident's meds. I called the referring doctor and the on-call doctor three times and never got a call back. My nursing supervisor told me not to worry about it that the lady was going to a different unit. When I left, I reported to the next nurse that we had no orders and it was now five o'clock on a weekend. When I arrived on Monday to work, the nurse on that weekend had a huge issue with me about not having doctor's orders and stated I probably should not have been left alone so soon after being licensed. I feel like I'm letting people down but no one is giving me answers to work with. Am I missing something in critical thinking or the nursing process? I just don't want to screw this up.
Thank you