Well, I graduated, passed the NCLEX, and got a job

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I start orientation on Monday and will be going to an Acute Rehab floor to begin my career.
My only experience has been through the clinicals I completed while in school and fully understand that I have a lot more learning to do with regards to nursing.
My question is two fold actually. First I wanted to know what more experienced first year nurses felt was most important (helpful) to concentrate on mastering first? What things helped you feel more at ease in your position?
Second, from preceptors- What do you like to see from your newbie nurses?
Any advice is welcomed. I'm just trying to prep a little before I start on Monday. I'm excited to finally be doing what I've been going to school for for sooooo long. At the same time it's a little scary knowing that there is so much more to being a nurse than just what I've been exposed to in the lecture/clinical setting.
Thanks to all that respond.