Finding a weakness in your opponent's soccer formation.

I think the best place for a player who is very weak and afraid of contact is a wing midfield position (e.g., LMF or RMF).

How To Determine A Child's "Soccer Age".

The Most Important Things to Teach Youth Soccer Players.

In my experience, enjoyment and success go hand-in-hand (i.e., most players enjoy a position more if they are successful playing it and don't enjoy a position where they aren't successful).

SoccerHelp.com explains the proper technique for an "Advanced Throw-In" and how to defend Throw-Ins so your opponent can't use them to create scoring opportunities.