need urgent help please!

okay, i am a level 2 manager.
I had a former formation 3-2-3-2
won the league
new budget had 1.1 mil, bought a ML to try the new formation i had in mind: 3-5-2.
now the problem is, I have only 4 subs, and my team is mostly 27 years etc, so slow development except for 2-3 players who are young.
i try to sign young players but i have 800k left and i end up in bidding wars :/
any help? and what are the best orders/tactics for 3-5-2


please reply!

Just set your best squad on the best possible positions, and set up the paramiters for tackling, passing etc.etc.
Also you can set the little arrows (blue defending - red attaking) for players who have much space around theyr spots.