I dont want to spoil you, by answering the question directly, so before reading this, please read all the draft related topics.
you start with a list containing player1- player 48.
this list is random for every team.
players have hollow balls as their star rating. The balls are hollow, because it is only an estimation
if you scout them once, you get the real star rating, the hollow balls turning into orange balls.
(a 5hollow ball player can turn out to be an 1ball actual, just like an 1 hollow ball can turn out to be 5ball actual)
interviewing a selected player will give you a lot more information:
age
height
position
grade rating - is only a finer scale for star rating, as you have surely read in the topic
potential - this is what everybody is after (a 5ball A+ guy with 1-2 ball potential is almost useless, because you cant really train him further)
to see all these information about a player you have to scout and interview him once. costing you 3 points
(or you can use the group demonstration to interview all the 1-2 hollow star rating guys)