i use the green packs i get in 12 days to power train the 4 star academy player to 6 stars. after that they are on their own. they tend to stay 5+ stars until they are 23-24 and then get replaced by the next generation when they are 26-27 (except now with 25 man squad this will change.)
it doesn't take much to have a good squad really. well, it takes time, but other than that. you get about 60 green packs in 12 days from training ground and by playing games. 10+ more from association games. a few videos per day and you have more than enough for 6+ stars.
and best of all, you don't have to worry about the transfer market.
the best idea is to have a full/proper youth team (ages 14-17) and youth competitions
also history for player development
instead of giving 2 players,
why not the academy suggest 3-4-5 different players,we choose the one we like for free,pay for additional if we want.