A good book is "The One Minute Manager" by Ken Blanchard. As others have said, treat the employees with respect. The people doing the work are your biggest asset or liability, depending on the mood at work. I would begin by observing the work flow and getting a feel for how things are going.
Don't go in and pound your chest and pronounce yourself King, just go in and be in charge. Comunicate everything with the employees, and they will appreciate your honesty. Don't comunicate, and you will breed rumors. Ask for their help instead of barking orders, and you should be pleasantly surprised at the results. If you do get someone who pushes back, quietly ask what the problem is. You may even have to be point-blank and ask "Who's running the show, here?", and hopefully the problem will see where the conversation is headed and won't push you far enough you have to put on your asshole hat and tell him what's what, but don't be scared to put the hat on and do the dirty work.
Where in Washington are you?