This formation is known as a narrow diamond. I'd go with 3-1-4-2 (3xDC/DMC/ML MC MC MR/2 Strikers). Narrow diamond attacks through the middle so the 3 DC + DMC should be enough to defend. I'd attack down both flanks with the ML and MR, but check out his defenders for any weak spots. If his defenders are weaker on one side go for that flank only. If you need to go more offensive you can switch the ML and MR for AML and AMR.