If it's a club for loaning out youth you'll want to make sure they have good training facilities, and check out their staff as well. Good coaches are important, but the manager and assistant manager as well. For example, a high tactical knowledge stat will be good as he's likely to win a lot of matches, increasing morale and getting the best out of the players. High man management is also essential, and a good working with youngsters and judging potential is required as well if you're going to send them plenty of youth players.