Where r the young players?

I haven't received any young players. I only have one roster spot open

Are you on about your youth players?

If so, they will appear on your squad list but you will need to decide whether to sign them or not. As you only have one spot open, unless he actually improves your team somehow and is in a position you require, sign and sell him for free money, then consider signing the better player (though it will cost you tokens).

Click on your stadium, then the u21 section. It'll say "2 new young players will be available in x days.".

as above but have you built a youth academy yet ?

upgrade your youth academy to highest level to get a frequent amount of good players

This is the second time no youth player has showed up on my squad list. Will really make sure next time around