This season ,i want to play 3-5-2 flat ,like this :

----------------GK------------------
----------DC--- DC--- DC-------------
-------------------------------------
ML------MC-----MC------ MC------MR
--------------------------------------
-------------ST--- ST--------------

Please help me config the best setting for this formation:

-Passing : mixed ,long or short?
-Where to put the Red Arrows and Blue Arrows

My team is a bit good (half 4* and half 5*) ,

Thankyou very much!!!!!!!!!!!