Congrats!! Your almost finished!!

I have precepted many of the new graduations hired in our ER. The most important thing to remember go in with a positive attitude. Let your preceptor know what you need the most help with. I always ask my orientees/students what they need or want our of their orientation, afterall, this is their time to learn. Always try to observe any new procedures, patient types (peds, OB, older adutl, etc), watch codes or traumas. Take it all in. Don't be suprised if you don't become addicted, ER is a great place to work.
As far as preparing, really brush up on your rythm identification skills. Review peds, cardiac diseases, neuro assessments(really important), and assessment skills. If you can review any protocols your ER will have that may be helpful.
The main medications we give in my ER is toradol, morphine, demerol, phenergan, lasix, insulin, iv antibiotics, cardiac drips (Cardizem, Lidocaine, Cordarone, Dopamine, Nitoglycerin) and a ton more.
Try to learn something new everyday. I have been in the ER for 11 years, and I still learn something new almost everyday!
Have fun!! Good Luck!!