My experience.
a. Scout : I always buy two or there scout in each season. I buy scout 22 year old , quality of scout near 7 star and especially " max value". What " max value " mean ? It's mean : " max value " of player > Money change from token in " Bank investment "- example : in level 14, Bank investment from 25 token is 58M so " max value " of scout will more than 58M. If value of scout is " max value ",quality of scout will increases faster when training.
b. Auction : of course in each season we must buy some young player. I just buy 18 year old player have quality near 6 star and have " max value ", max value of 18 year old player = Yx35:25, with Y : Bank investment from 25 token.
That is my experience, hope you can understand what thing I say and hope will help you when playing Top Eleven