Find out all the possibilities for hiring research and teaching assistants, if these aren't automatically given to you as part of the job. Remain confident in yourself, your abilities, and your plans. You are no longer a student but a professional, a faculty member. Learn all you can about how the department works, observe your colleagues, and see where you fit in. Consciously think about how you want to be perceived by others and make sure your behavior supports that view.
Every organization has issues and alliances.
Don't take sides on anything until you've had a chance to learn what is going on and to form your own judgments. As you start to meet people, listen carefully and take the opportunity to learn from everyone. However, keep in mind that there are at least two sides to every issue. Don't form judgments at this stage. Take everything you think you learn as a working hypothesis and continue to look for more data.