when I was level 1 I had 3 friends playing in my league. Tried to sell some poor 1 star players but at level 1 no one wants to buy them because any other active manager wants to buy higher star player to improve their team.
As you reach the next level your poor 1 star player may look like a good 2/3 star player to a level 1 manager so tends to sell easier !!
( hope I explained that hun ) ???? lol
also you get money from what position you end in the league and although supporters are not alot the more you get the more income > I actually ended up selling my best player and made enough money for 2 or 3 normal players ( not sure if that was right or wrong ) lol