how to play 4 3 3 effectively?

[t11_fan]

This is offensive formation so you don't need attacking mentality, you could play with normal.
Maybe it's weird, but I'd place blue arrows on 2 attackers and one mc. No red arrows.
If your opponent is significantly weaker, remove blue arrows.

Most important rule about 4-3n-3 is not to use it against 4-1-4-1.

[mekale]

This is offensive formation so you don't need attacking mentality, you could play with normal.
Maybe it's weird, but I'd place blue arrows on 2 attackers and one mc. No red arrows.
If your opponent is significantly weaker, remove blue arrows.

Most important rule about 4-3n-3 is not to use it against 4-1-4-1.

what is your point by putting blues on sts and mc?