Lead by example always remembering to set goals and giving constructive feedback when necessary, and having an open-door policy.

Knowing what motivates your team can hepl in leading them, but also having a defined goal and steps to achive it.

I leaarned that to be an effective leader you must most more than you teach, also make sure you are getting your team to collaborate, and share.  You also must give constructive feedback, but never harmful. Consider everyones point of view not just your own.  In the end make the decisions that best accomplish the goals of the department.