Your best prospects look to be backcourt guys, so train them for now and scout the shorter players in your next few drafts. Like he said early arena building is very important. As you train say PG/SG, you should be buying veteran C/PF(if they'll help you win), then around mid 20s for your backcourt, look to draft taller guys. SF needs to train inside and outside, so try to grab prospects for that position at the tail end of one half of your training, then give them the training with your new focus as well.