FIFA 12 3DS Cheats and Tips

Just find a player that you want to buy and click buy, then you will be entered into the market/bidding and if you need to then higher the price or do nothing as long as no club bids. If the price gets too high then don't bid again and anyway you'll be able to cancel the transfer if you want to afterwards.
Once you have your player the money fee will be deducted from your club total and becasue you've bought (or sold) a player, one 'TRANSFER POINT' will also be taken away. This will happen every time you buy or sell a player.

Just go into kick off mode and connect another controller. Then choose the desingated side, team and stadium.

PRESS L2 AND X!

Go into the calendar and you should be able to schedule training sessions and friendlies there. If not, then maybe you will be able to do them before the season starts.

Promote them to your academy can help stat-wise. But playing them is really the key. Bear in mind that according to what the game says, difficulty does not matter in terms of stat gains, so you can make that process a bit easier on yourself.