When creating a player, leave his bio, equipment, looks, hot zones, and batter tendencies alone. Set all of his batting and fielding stats to zero. Do the same with pitchers, but also make their pitches bad. After that, sign him to a seven year, $300,000 deal to the MLB. Then, edit their stats and make them perfect. This works for owner mode. When their contracts are up, release them and make new players. You can make them look however desired and give them whatever bio you want. Try to make them born from July on in 1987 or the year that they turn 17.