I'm level 2 right now, so still making mistakes perhaps. I've sold a couple of players and was sorry later, as the ones I kept from my original given squad are now all 5 star just from good training. Some of the players I bought in have been stinkers, and finding them hard to sellon, will probably end up just sacking to make room on the bench. You learn as you go. I'm sure almost all real world managers regret offing and buying certain players over the years