Think of the team manager as the Staff Sergeant and the parents the Privates with a few Corporals thrown in. The Team Manager leads this rag-tag group of complainers and chauffeurs into battle. As noted, the team manager is basically the right-hand person for the coach, hopefully, freeing the coach up to coach the players. The team manager does the paperwork, communicates the necessary details, and makes sure the various Cal South / League / Club documents are at hand on game day.
A few mistakes I have seen some team managers make is ...
1. Lack the backbone needed to control the troops. The SCDSL will have the parents sit on one side and the coach/players on the other. The team manager needs to sit with their parents. Maybe a lollipop will work, but when Loudmouth Parent 1 and Idiot Parent No. 2 start getting out of hand, the Team Manager must be the one to pull these two jokers aside and enforce the rules of the League/Club/Team. He/She also needs to communicate with the opposing team manager if things are getting out of hand over their or parents begin editorializing. I've seen many team managers that have all the organizational skills, but lack the backbone to confront their own parents and/or talk to the opposing team manager. Its the team managers job to to that (especially in the SCDSL, see,
http://www.scdslsoccer.com/_files/2016gamedayinstructions.pdf)
2. Print the schedule out on some nicely formatted sheet and deliver it to the parents before the season. BIG MISTAKE, because schedules always change ... field number changed, game time, etc.
3. Take on too much basic stuff. At a certain point, if a grown-ass parent cannot figure out how to look up a schedule online and devine appropriate driving directions on their own ... club soccer isn't for them.
Communication is the key. If you decide to be a team manager skip the emails and text and use Remind (its probably on everybody's smartphone anyway). Make the coach send his/her own damn messages through remind so nothing gets lost in translation.