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The most commonly used formation in British and European football is 4-4-2, where the players line up with 4 defenders, 4 midfielders and 2 attackers. Note that all formations are broken down in this manner of
Defenders-
Midfielders-
Attackers, except in cases of deep lying forwards or defensive midfielders.
A common variation on 4-4-2 is 4-1-2-1-2 which features 4 defenders, 1 defensive midfielder, 2 midfielders, 1 attacking midfielder and 2 attackers.
Other formations you might try are 4-3-3, 4-4-2 diamond (in which the 4 midfielders are positioned on the pitch as a diamond) and 3-5-2.
Note that players should be picked according to their position wherever possible. A central defender (CD) won't be too happy about playing at right back (RB) unless he already has experience of playing there. Similarly strikers almost exclusively want to be in front of the oppositions goal, so avoid moving them to the wings unless they have played there before.