What advice can you give for a new NCO to become a better leader?

Seek a mentor, Read the Creed and understand it. Speak to your mentor about hit. Figure out how to employ is within your daily activity. Lead from the front, find time to speak to your Sokdiers, know what makes them tick. Take leaderships guidance and directives determine how to execute best based on the abilities of your Soldiers and own the result. Never play the blame game. All leaders falter, it is how you get back in it, facing leaders and subordinates. Commit to excellence and treat your Soldiers with respect.

Your subordinates will emulate you - for better or worse. If you cut a corner, they will see that as acceptable and they'll do the same. If they see you slide out of something, they'll expect it as well.
Like the old Traits of an NCO listed, SET THE EXAMPLE that you want to see in your people.

Just do your best, don't treat your underlings like dirt, but on the flip side don't let them treat you the same way, use respect and treat them fairly.