Your youth intake will depend majorly upon your HOYD..
how the players shape up once you've got them will depend upon your academy, the youth coaches, et al..
your scouts work extensively to bring young players from their expertised regions.. and that will depend on your scouts.. so a world class scout with a 20/20 JPA and JPP is more likely to bring in some amazing talent from his area..
also, your youth networks- affiliates, you'll have a few players from them as well, the brightest talents maybe, entering your youth intake..
and hoping to grab players from other clubs' intake before they join them for Trials, I don't suppose that's even possible.. not for free anyway, you'll have to pay the club a fee, as approaching to sign them they'll reject you stating they've just joined the club and blah blah blah...