New hospital EMT

I just got a job offer for a critical care tech at a big hospitals emergency department near me. I’m an entry level EMT-I and I’m 18. I’m kind of nervous to be starting off in such an intimidating environment. Anybody who has worked in the ER’s advice would be much appreciated. Or honestly anybody who has gotten past the initial first job scares. I’ve worked a minimum wage for a few years but this will be my first time in an environment so professional.