ok Andurilz is right about changing tactics.
Changing tactic too often is not good.
if you are weak team ,and play ahainst some big team i must recommend you 1-4-1-1-2-1
your side back's must be good at wing back positions,and other positions are common.that AM should know how to score
note that these formations are not for long period,just for certain games.
about long period tactic,of course 4-4-2 is the greatest.would you play "line" or "diamond" it is your choice.of course 4-4-2 requires most common positions so can be played by almost any team.
and just a word about some tactics thing in FM08.
After period of a few months my team start to play bad,every formation lasts for some period and than i must find a new one.I read some posts on the internet about that and many people have this "problem".now maybe the game works like that,maybe other teams get used to your play,and learn your play so it becomes tougher.if it is true,well good job SI.But if this is not normal,than MAKE THE NEW PATCH.
and a word about those MANAGERS to tell that they need only one or two tactics to play this game.
i read many posts lately and i see posts like this(example):
i play great with just one tactic,in every match i go for win....bla bla bla. I PLAY WITH BARCELONA or MAN UTD, or CHELSEA , REAL........
the thing is ,they upload their magical tactics(they made with it great things), and then people download them for some weak team,well i does not work.THE BEST WAY TO MAKE A TACTIC IS TO LOOK FOR YOUR PLAYERS.
also when you play with strong team you do not have to change you tactics so often as you would with weak teams.
i started with Barnet in Coca-Cola League 2 and until Premier League i used 4-4-2 and against big teams from Premier 1-4-1-1-2-1.but in premier it is getting tough so i must change formation more often.
because of that i never post team and player instructions.
Formation can be shared,but NOT instructions.instructions depends on your players attributes.
than about players age,well i is good to have young players in 2nd,3rd,4th league,but in Premier you must have more experienced players.