New coach starting out - tips, do's & don'ts

Hi all, I've recently taken over coaching an U9 team. I have passed the BT playmaker and have scheduled the introduction to coaching course.

I've taken 3 sessions and overseen 2 friendlies, both losses. My question is what are some do's and don'ts for coaching at this level? I don't want to be overbearing but I do want to be able to get the kids to know how to win football matches.

Any advice would be greatly received.

Thanks.