Set your Youth Team level to 5. The next year in Master League you should have 
at least two stars in your youth team. For example, the youth team spotted 
Klasnic 16 and Amanatidis 18 when using Barcelona. Other teams have different 
stars. Go to advanced search, and put 15 to 19 for the age. For example, Carson 
in Sampdoria and H.Larsson in Racing Club. Teach them a lot of Ability Cards and 
Positions and loan them out to make them better.