On the youth player page (which is located under "My club" in the top menu) you can bring in young players from all over the world to your club.
When bringing in youth players you can choose to generate the name of the player automatically or you can type in the name your self.
You must also define the player's nationality, age and position on the pitch.
The quality of the player is 100% random. Often, it is a good idea to keep your young players in the club for a couple of days at least, to test their abilities during training.