When I make a tactic I break it down accordingly:
- how do I want it to play (so this would be like the mentality/structure of the team)
- what formation fits in well with my philosophy (there are good and bad formations for each mentality IMO, based on the players being in certain parts of the pitch, etc)
- what instructions promote that philosophy
- what roles will fit my players and how I want the tactic to play
- how does each role interact (and subsequently what kind of space or cover does each provide for eachother)
Just as an example for my first season with Liverpool I wanted to play a controlling style that emulated Klopp's high tempo, high line pressing. Control might not sound like it but it's an attacking mentality that's just a bit more cautious on the back end than 'Attacking'.
So how would we implement this?
Well to control the game you're going to want to have support in the right areas. Support mentalities will generally help keep hold of the ball better rather than rushing forward and playing quick passes to start attacks. You want the ball as much as possible so you want to be harrying the opponent and not giving them much time on the ball to make decisions. You will want players making constant off the ball movement to open themselves up for passes. You probably want to keep those passes shorter and building out from the back so that you're not often forced into duels for the ball when you have it. You'll also likely want to be a bit less cross happy and take less long shots which are lower % chances and mean you lose the ball a bit more.
So at the end of the day you're probably left with something like this:
- Higher line
- Close down more/much more
- Tighter Marking
- Play out of Defence
- Pass Shorter OR Retain Possession (you probably want meaningful possession, not just possession without penetration and both is a bit of overkill)
- Work Ball into Box
- Roam from Positions (important for creating space)
Now there are a few other things that can be situational. Offside trap is good against slower, cumbersome attackers, but quick ones will often punish you. Tackling and width are in game adjustments you'll have to make based on how you see your team playing (more width will generally open the other team up more for attack but also means you'll have to make longer passes, while less width means you'll have closer options but it's a bit easier to shut up shop against). Finally the mentality is really important...structured and very structured will mean you want your players to do exactly what is asked of them and there is more inherent space between them as they contribute less to each 'phase' of play, while Fluid gives a bit more freedom, and shortens the distance (vertically) between the back and the front of the tactic (and players).
This is what I ended up with keeping all of that in mind:
It worked pretty well, as you can see above. But again, especially in FM16 you can't just take a tactic and apply it to any team and expect it to work (I tried with Heerenveen and Frankfurt). Tactics need to be, and should be, tailored to the players you have (for the most part). Or you can try to train the players to fit the tactic. Overall philosophy can still be the same but the individual intricacies of it will shift a bit depending on who you have available.
I suggest watching the full match (not just the highlights) in at least a few of the first games to really see what your team is doing well, where the players are taking up space, and where your team is breaking down. Tweak accordingly. It's really important though to understand what space each role occupies and how they interact with those around them, so the tweaking requires an understanding of all of that plus how the instructions cause them to act.