You use 3ST formation so i would suggest blue arrows on defenders. 2ST and MC too (left and right one),
This formation is offensive by default and that's why i suggest blue arrows. Besides that, most of managers use attacking setups with red arrows so use blue as counter.
Offside trap is risky and I think that it should be used when you are attacking, opponent defending and trying to play counter attacks against your team, so better get some info about this tactic http://forum.topeleven.com/formation...side-trap.html
You should focus passing through middle. Use normal mentality against weak opponents and defensive against good opponents.
I personaly like to combine opposite tactics and formations (defensive tactic with offensive formations and offensive tactic with defensive formations).
All in all i'm skeptic about this formation because it is weak against 451V (one of most often used formations...)
Besides that, be cautious against 2ST formations, they usually make a lot of problems for 3W defence.