New Job As Network Engineer

I'm sorry if this isn't allowed since it is some noob stuff, but I just got my first job as a network engineer after passing my CCNA. It will be a job for a major city supporting all the infrastructure. Just wondering, what are some mistakes you all made when you first started that I can avoid? What are some things I could come in knowing that would impress my boss? What do you think he might start me off doing? What are some commands that I should have memorized? If you've worked a city job, how is/was it? He kinda knows where I'm at already, and he said he was willing to teach me. He got us both a seat for CBT Nuggets so its not life or death, but I want to start out on the right foot. Its my dream job.

Thanks!