Inside Shoulder, What are the objectives and expectations of your team (incl parent group)?
a.
Rugby is for fun and equal playing time for all as per various Codes of Conduct. Have pre arranged player swaps at the 1/4 time, 1/2 time, and 3/4 time mark. Keep a check of this in a notebook. have a parent or team manager operate the system. Short of injury replacements this works well with Juniors. Seldom will you get a parent group that wholeheartedly endorses this approach. If it is a 15D or lower School team you will "get away" with this. A's to C's parent groups tend to fall into the groups below.
b.
Rugby is for winning. Parents and players expect/demand victory. - Run for the hills. You will be inundated with emails, texts, advice from players and parents about how good Oliver All-Star is, and why John Fat-Kidd should be benched to allow Oliver to be the Captain/Openside Flanker/Five eighth. Doesn't matter what you do here, you are on a hiding to nothing. You will not please even if your name is King Job Solomon.
c.
We want to get better. Parents and players expect some moderate development. Focus on one or two players each week and keep a bit of a personalised tick sheet on their stats - ie tackles made/missed, good/bad passes made, try assists whatever it is that you want to focus on for that player to improve on in their part of the game. Keep that data and later in the season repeat the exercise. Compare the performance. Give the kid positive feedback. Don't try to analyse the entire team individually every week. You will drown in data gathering.
I am probably preaching to the converted but managing parents will take up almost as much of your time as managing and coaching players. The approach taken will depend largely on expectations.