Learn the importance of quiet dignity, absolute honesty, and reserve audacious behavior for situations that required it.
Respect and honor the experience of your NCOs and defer to their better judgement in situations you do not fully understand. Listen to your NCOs, learn from them - but also remember they are not Gods, they can do wrong and they do need leadership. Watch them carefully, you will quickly learn which NCOs are valuable and knowledgeable soldiers, and which couldn't lead a starving man to the chow hall.
Remember that sometimes, the best ideas come from an E-2. If you want to learn about the equipment in your team/platoon talk to the fella who actually operates it. A young soldier loves to tell someone "just how much he knows" about HIS piece of equipment, he will talk your ear off if given the chance, that's where you learn about him and his gear.
Be confident, but keep your humility.
Focus on the good of your unit, and it's ability to survive without you. You may not always be there, so allow your NCOs the freedom to act within your guidance. Make certain everyone knows the importance of their job how it fits into the mission.
Always lead from the front. Your men do not serve you. They serve the mission. You serve them.
Last, but not least: When the shit comes rolling downhill. Let it stop with you. Do not betray your men, or their trust by bypassing blame or bending to political pressure. When your NCOs are right, be willing lock horns with anyone to defend them. In other words, be willing to "bet your bars."