Having been in those shoes, one of the most important things I can tell you is to follow this principal that I learned from a former boss, from a former referee (and mentor), and General Norman Scwartzkopf:
When in command, take charge.
Everything Line_Judge said is right on. But there are other things, like room mate assignments, selection of restaurants, time for departures, etc., that will occasionally elicit disagreement among the crew. By all means, give the crew opportunities to reach a consensus, but, when, needed, step in and make a decision, and issue your directive. Here is an example: At one venue, we dressed in a remote location, and were driven to the stadium, when ready. Obviously, my U and I needed to be ready with enough time to visit the coaches beginning at 90 minutes before KO. One member of my crew was insistent that those that wanted to take their time getting dressed should be allowed to stay in the dressing room, and be brought over to the stadium later. Obviously that meant the stadium management would have to make two trips for us, and that was just not an acceptable inconvenience to them, in my view. I directed that we would ALL travel over to the stadium at the same time, so management would only need to make trip. While not popular with that one crew member, that’s what we did. It isn’t a democracy. Somebody has to make decisions, and that’s what a crew chief does.
Take charge.
Robert