here is a guide about fast trainers and values of the players
https://forum.topeleven.com/tutorial...-trainers.html

and values of the players #172
https://forum.topeleven.com/tutorial...ainers-18.html

Your money is not enough anyway to build a team with young expensive fast trainers.
So the logic is to buy 4-5 and keep them in higher quality (7* at the end of the season) for 4-5 seasons.
Prefer some key positions
AML, AMR
and build a DC-DMC-MC
an all-around D (DL-DC-DR)
and ST-AML-AMR

You won't make money from developing and selling fast trainers.
You 'll earn money from winning titles and because you won't need to spend a fortune (token and money) for those key players every season.

* some other useful treads here
https://forum.topeleven.com/tutorial...ii-2017-a.html