"The arrows only serve for a player to advance a little further from his position, then you need not put blue arrows on defense players because it does not retreated more than the edge of the field."

Well, basically arrows focus the player more in attack, or in defense. A defender with blue arrow will decrease the %'s of attack chances and will stay more in defense than without arrow. Same with Strikers.
Despite all, and like always, all affect a little, slighly many times, is not something "exact" and for example I use red arrows for ST's and blue for DC's, then red for DR-DL.

Very often, the common situation is that the DC's stay in defense, but, in some ocassion, or match, they score and participe with defensers in a attack, for example DL assist and DC score.

The red arrow in DR-DL make of them ma team top scorers. really are better than the ST's.

And the red arrow in the ST, have as answer that, in many matches, they are in attack. But, is not strange in some occassion see a ST saving a counter in defense.

So, as Ive said, all, affect a little, and depens of how is raised the match, and too, the "internal base of the player", for example some MCs tend to defend, and help very good in this labour, so.... is more extense really xD


About orders... I would put red's to DL-DR and wingers, and attack focused there. Mixed passig to start and attacking. The important is to have the control of possession. If not, try change some option, as mixed to long passing and maybe attacking to defensive. Is good to have 2 groups of orders prepared.

Then if usually the man who shoot fouls and corners fail, prove another. Is good test and find one man for each work, and usually inside the team theres one better for this every season.
Good luck