well....im pretty new to this game
but what i did is kinda look up my opponent's recent games and see what tactics they play. After, i will look at their players' DMI, see who are the best players on his/her team.
so for example, if he plays play inside and have alot of good Cs and PFs, i will play 2-3 zone, which strengthens my inside defense and vice versa, if he has good perimeter shooters, 3-2 zone.
thats just how i do it....u dont have to follow it exactly
hope this helps a lit bit =D