You will have nine players who will want to play every game. Once you know who they are, after they complain about not being used after your first game, use them 90% of the time. Use the other players in cups and loan a few of them, but check your team after every game. When selling players, sell them. Do not release them, because the team cracks up. If players need a break for just one game more than more game off, they will complain.