Do you believe in the concept of Team? This is a good question to ask yourself (of course!) as well as those whom you consider to be members of your team(s). The whole being greater than the sum of the parts. This is a general definition of team; and each person in the group needs to really understand what that means for a team to work.
Human nature leads to me-first attitudes. TEAM means resisting this at times, and it’s a coach’s job to illustrate the need for TEAM in order to accomplish goals, just as it is to help kids learn to put themselves second to the team. Simple, but not easy.
Before you can develop TEAM, or team players, even, you should, Coach, confirm that everyone believes it’s a good idea.