As a manager, Guardiola won 14 trophies in the first four years of his managing career. He is one of the most successful managers in the world and is considered by a number of players, managers and commentators to be one of the best managers in the world.
The FM 2017 TacticIn Training
One model to use is 2 weeks tactical, 1 week ball control and 1 week attacking per month.
But this comes down to analysis of your squad, periodic performance analysis of areas your team might struggle with, either its low goal scoring ration, poor passing or lack of team movement and tactical understanding.
Recommended pitch size in my point of view for any possession tactics are:
Standard - Tick Team Instruction Play narrow