Im gonna sell my whole roster and I want to know if i should by 7-10 players that are 9-26k or should I buy 5 trainees and a exceptional trainer and train my player or what should I do. Also check out my roster to help with your decision.
Neither. What you should do is probably the exact opposite of what you've done to date - sell those high wage guys, buy at most a level 4 trainer with a reasonable (<15k salary), cheap young trainees, and then fill the remainder of your roster with guys in the 7-8k salary range. More importantly, though, put as much money as you can into upgrading your arena.