Well, for me, Im not a fan of "full arrows tactic" but I believe arrows help us alot! for 4-3-3 N, I would say attack mode, through middle, mixed/long passes, red arrows on DR/L to fight against team with wing mids, and 3 red arrows on 3 STs.
I myself define Arrow this way:
player with 2 position such as: DL/DML is ok to put red arrow, same as ML/AML, as they are built for attacking with red. In the Vice versa, ML/DML is ok to put blue arrow, DC/DMC is ok to put blue arrow as they are built for defending with blue. Other players with single position shall not get arrows as their rating will certainly go lower.
Effective attacking formations are vary, however some well-known are 4-3-3 N, 4-3-1AMC-2, 3N-4-1AMC-2, 3N-4-2 Amr/l-1, 4-2-3 Amr/c/l-1, 4-5-1 V, 3-5-2V, 3-2-3 Amr/c/l-2, 4-3-2 W-1.....last but not least, there is no best formation, just best tactic and experienced manager!
Im vietnamese too, so feel free to speak Vnmese if ya want to understand things deeper! Facebook: GB Nguyen