Right the safe normal option would be to put blue or no arrows on the defenders, no arrows or red on the DMC!, reds on the all midfielders and strikers! thats what I would do!. as for settings try this for starters then tweek to suit different opposition.
Team mentality... Normal or defensive for playing against stronger teams and attacking for weaker teams.
Focused passing ...Mixed.
Pressing style..Own half.
Tackling...Hard for stronger teams .. normal or hard for weaker teams.
Passing style.. mixed
Marking style ..Zonal.
when you are saying reds on the all midfielders and strikers.. strikers you mean also AMR-AML ?
Passing on both flanks, short passing. Redarrow on aml, amr and maybe dl, dr, blue on dmc
Your are the most effective if you use: defending, both flanks, own half, hard, short, marking, counterattack
Prove in some friendlies to put 3 red arrows in the 2 DC's and the DMC and 7 red arrows to the other players.
Team mentality... Attacking
Focused passing ...mixed
Pressing style..In all field
Tackling...Normal
Passing style.. long
Marking style ..Zonal.
and more important, that's to obtain more of the game, if, in 50 minutes of match you, don't see the name of a MC or ST, change this for antother. That's a +1 point for you as a manager if you can know how your team plays, in what players you can have confidance, or, what player put in the minute 75' that can score in the 50% of times.