of course every team needs a formation.  what i am saying well known formation such 442 or 433 or 451 doesn't work for ametuer soccer.

I played formations such as 14221 which work very well. And i dun believe you could play in higher lvl competition.

one of the key reason y a formation is vital is to know where you teammates are without having to look at them.

Of course we do not underestimate the potency of aerial threats. It is just very easy to counter.

1. let them cross at line instead of deep.
2. gk catches the cross.

Sounds so easy but is the truth. even national level junior players are unable to produce nice cut back crosses further more an ametuer player. why? crossing at line means you be sprinting. to turn ur ankle 45 degrees can easily twist ur ankle to take the kick. so usually they will end up hitting 30 degree crossing closer to the gk.
A good gk would easily catch the ball.

So you don't have players with the stamina to play 4-4-2 with wingers. So; why don't you play 4-4-2 without wingers? It's also known universally as the "christmas tree"?

Also another popular choice.

15 players, sounded like rugby to me, someone call monstar...