How can I be an effective and productive NCO without guidance, mentorship and coaching to get me there?

BLUF: I need a mentor, and my unit is not supporting this. How can I be an effective and productive NCO without guidance, mentorship and coaching to get me there? Is there an RP member (preferably in Infantry Branch) that can help facilitate this? To clarify, I am in a BCT battalion. That's Basic Combat Training, not Brigade Combat Team. I work for the S3 shop. I have several NCOs that I COULD follow along after, however, none of them are willing to take the time to be a true NCO for me. There is no leadership for me, until it is time to drop the hammer on Joe. I have an E8 MSG that is trying to help me out, but most of what he is giving me is "read the FM." While I understand that the FM is important, and I have been digging into it, it does not teach you how to be a good Team Leader, Squad Leader, Platoon Sergeant, etc. And with the goals that I have for my career, I am in dire straights for a sound NCO mentor that can teach and show me how to lead, train, and coach Joe when he is under me.