Imo the best way to start is by combine. U'll get all the heights and ages of all draftees. That's a great ground to go further. You can select 18yo's and separate them from 19yo's, sort them by height and then continue with your scouting depending on which position u r looking etc.
I used the combine and got 19 18yo's from which only 6 had worse than 3star raiting (and of course I wont even wanna consider looking at them anymore). Things looking pretty good this year
I assume that with "3star rating" you mean 3 grey balls? Please don't assume that the grey balls you see in the beginning mean
anything. They're really useless and you can ignore them. The players with 1 grey ball are probably just as good as the ones with 5 grey balls.
We have both said a lot of things that you are going to regret.