you should not spend any money until you know what the effect will be.
Best to start off with selling some players.
Look at your players, decide which 10 you would like to play with regularly and sell the others.
It's okay to sell one of your best too, but keep a few, winning is important in this game, much more than in HT
They are not your friends; they dispise you. I am the only one you can count on. Trust me.