You will have at least nine players who will want to play every game. Once you 
know who they are, use them approximately 90% of the time when they complain 
about not being used after your first game. Use the other players in cups and 
loan some of them, but check your team after every game. When selling players, 
just sell them and do not release them, otherwise it messes up the team. If 
players need a break for another game, they will complain. Each year you keep 
your team happy, the next year they will not have those problems any longer and 
be happier overall with the club.