V style is midfielders at V shape( DMC - MC - MC - AML - AMR). W means wide positions, example DL/DC/DR is 3W defenders. Diamond means midfielders with DMC - MC - MC - AMC. N means narrow position, example MC - MC - MC or DC - DC - DC.
That tactic is illegal in old days, but not anymore. I recommend you to use 4-1-2-1-2 Narrow Diamond or 4-3n-1-2, attack through the middle.