A good rule of thumb would be to base your tactic on a preset style.
Let's say you want to create a high pressing tactic where your best players are the left wing back and the right winger. You load up the Gegenpress style and take a look into the TI and player roles. Then, you change the roles to get the best out of your two star players (e.g. CWB/a and IF/a) and then adapt some of the TI to encourage some movements involving those two players (e.g. "Focus play down the left", "Run at defence", or "Pass into space").