I just started in the ED in December, but had done some work in LTC and M/S, but only per diem. They had an extensive "new grad" program for new ED nurses too, which included classroom time and floor experience.
My advice is to first be willing to admit you know nothing. I had nurses that started with me also, but had lots of M/S experience or whatever, and thought they knew it all. They didn't. I was used to doing full head-to-toe assessments on my pts. That wasn't what we were supposed to be doing in the ED, so it was hard to get out of that (not talking about the trauma pts now, just the ones coming in for a sprained finger or dislocated shoulder or cold sx, etc). But that being said, you have to be able to learn what are some good ways to do things and what are not.
Just a "for instance", blood cultures x2 are something we do all the time. However, my instructor told us you'll see a LOT of nurses doing them wrong, and they KNOW they are, but are trying to "save time" or are just plain lazy. First, they aren't doing them 15 min apart - just labeling them as such, and a lot of time, are pulling them off an existing IV line, which is not going to culture the blood, but the line itself. They should be done on 2 separate sites 15 min apart, and unless the IV line is brand new and the blood drawn off it right away upon insertion, a butterfly stick should be done on 2 separate sites. I can't tell you how many nurses (and paramedics who work in our ED) would draw 20ml all at once off an existing IV line. I know we're all busy and it saves time, but it doesn't help the pt, and the results may be erroneous. So be open to learning - learning the right way, maybe learning some short cuts (eventually, but learn the right/textbook way first) and learning the wrong way so you know what NOT to do. Does that make sense?? lol
(BTW, I'm not saying this to be flamed! I know I'm new to the ED and don't know much, but this was just an example of something we were told and I also saw).
Take advantage of "down time". It very rarely gets slow, at least where I was, so I decided during those times I would learn a new rhythm strip, review a certain protocol, learn some new drugs, etc.
I also always kept by IV drug book and Drug guide with me. I looked up drugs I had never given before, and would do that until I'd given the drug several times. I kept a notebook with me and would write down notes, then would review them later.
Ask lots of questions. Practice all of the common skills needed in the ED until you can do them in your sleep. Part of our ED school was just doing skills for about 7 or 8 shifts. All we did was blood draws, IV's, catheters, 12-leads, NG tubes, etc. If there is one skill you need practice on, ask everyone to let you know if they have a pt that needs that. Don't shy away from what you don't do a lot or don't know.
Well, I've written a novel, but congratulations! I'm still learning too, and don't be afraid to tell people that you've never done that before, and would they guide you through it or ask for help. Most of the nurses and techs and docs I've worked with are more than willing to help!