Communications - #1. And that means both talking AND listening. Be willing to accept suggestions beyond those of their own. Put themselves in the shoes of the employee and think in their terms. And lead by example. None of this "do as I say" stuff.
Open communication is excellent. Employee training so jobs can be done well. Update your skills to keep things fresh. Consider input. Effective delegation. Trust. When you need to get employees back in line, try and make it a win win. Do not embarrass or put anyone down in front of others. Be positive. Grow morale.