yhh basically you filter them out so you can put age as: 14-18 years old and then PA: 180, this will then list all the 14-18 years old with the potential of 180, and so on if you put PA as: 155 it will list all the players in the game with PA of 155. Every player that exists in the game is listed, so at the start of the game if you dont put in an age but set PA at: 190, you will have Lionel Messi, Cristiano Ronaldo all listed, you can also filter it out as CA (current ability) and by any stat you wish like finishing, heading ect.
I have stumbled across loads of gems, especially in Africa with teams ive never heard of, and also lower division french teams generate some pretty good talent. What i do is have a look at their potential stats, so you see their stats as they are at the present time and then stats that they potentially can get too, decide whether i want them, give them a trial and sign them!