In the ED
1) Read up on basic DDxs and workups for common cheif complaints: Chest Pain, Headache, Weak and Dizzy, SOB, Abdominal Pain, Pediatric Fever, etc
Concentrate on the dangerous diagnoses like MI, appendicitis, etc and know how to rule them out.
2) Pick up a sheet of paper and make a scutlist each shift. Enter each patient like this:
Age, PMHx related to CC, CC. then a list of things that need to be done
e.g. 45 yo male h/o DM, HTN co CP x 2 hours
scutlist - make an empty box next to each item, then check the box when it's done. When all of the boxes are filled, you should have disposition
EKG
CXR
labs
3) During your history, don't go overboard on your review of systems. Stick to problems related to the chief complaint, otherwise you will end up working up an old lady's arthritis, GERD, hearing problem and anxiety when she came for asthma exascerbation. Everything is nothing, but one thing is everything: patients with a hundred symptoms are usually not sick, patients with one overwhelming symptom often are sick.
4) Remeber as an ER doc you're not as much responsible for making diagnoses as you are ruling out emergencies. If you think the patient is not sick, make sure you have ruled out clinically or with labs/images all possible dangerous diagnoses. It's okay to send someone home/upstairs without a diagnosis as long as they are stable and will get followup.
5) You're an intern. Ask questions and prepare to feel stupid. It's part of the learning process, and everyone understands you're new.