I think it's best if you pick an offense that you are going to aim for first (say run & gun). Then I would train PG & SG and just buy cheap older players to fill the other positions. You won't need really good players there until you move up. It's too hard at our level to make enough money to buy a good team, but we can buy old players is our salary range that are cheaper than buying all young guys that you aren't going to train much anyway. It will keep your wins (and money) up while you train what you want.
Hopefully I lose my championship game today so I don't have to worry about the implications of moving up... lol.
No matter where you go, there you are.