look mate .. 4-5-1 V in a brief
it's a great counterattacking formation IF used the right way
DL-DR, AML-AMR, ST should have red arrows , this will be your attack , with " down both flanks " not the middle, that's the point of 4-5-1 V , the flanks not the middle.
DC's and DMC should be blue arrowed , if your opponent have a really STRONG MC's your MC's too should be blue, if not just leave them un-arrowed
press own half yea with counterattack of course , mixed passing
mentality : depends on your opponent , just forget about "hard mentalities" it is either attacking , defending or normal. as for me i'd use attacking if i had strong wingers.
defense : zonal mostly, but if your opponents attackers are weaker than your defense use man to man
tackling : hard tackling could destroy your team and dreams sometimes , as it will cost you alot of cards and even goals from PKs or Fouls, so if a better team use normal, if a weaker team use easy.
good luck mate