You're lvl1 manager. I don't know how much do you know about this game, but your players will lose 1 star next season because higher level. Then you'll be able to sign same quallity free agents.
I think you'll have to sell them because level 1 league bonuses aren't that high to cover your negative balance. New sponsors contract next season could help, but you won't have money to buy good players.
Wait for next season start, free agents will be better and more valuable.3: to get more money when you have no debt, go to the tranfer market and search for a free player, sign them and resell.