Custom Tactics....looking for tips!

[saints0221]

Ok guys, I am looking for some guidance. I understand the game fairly well, understand the use of formations fairly well, but I'm still struggling a bit with Tactics and how to use them in the game...could someone provide some thoughts? A few specific questions to get the ball rolling:
1- I like to play a methodical, passing game, but I like to create chances in a fairly balanced way, i.e. not always from the cross, but rather taking what the defense gives, so I will sometimes try to play a nifty through ball down the middle, or a cross in, or a chipped through ball, or even just wheeling and striking a shot from distance. How do I use tactics to support this?
2- Even more basic, if I set build up play- passing at 20 vs 70, what changes?

Thanks guys!!!