I 'm trying to have 8-9 young fast trainers
(here https://forum.topeleven.com/tutorial...tml#post500463 )
and keep them from 18 to 21/22 y.o.
I use them in my games and do some training so they can go from 90% to 110/115% every season.
I also have some 2*-3* cheap players just to complete the squad and do training for the bonus.
Every new season , the first 1-2 days I 'll buy 2-3 not attractive 80% players just to complete my 11th squad and later when the market calms, I buy the rest.

Selling doesn't matter, I just set the higher price.
Bot teams are buying and selling the players anyway.
Only from negotiations human managers buying or selling players.
https://forum.topeleven.com/top-elev...g-players.html