
Unfortunately, friendly matches are virtually meaning, and you won't get a true read on your opponents until competitive matches are underway. On top of this, you have to watch and really pay attention to each match to get a better sense of your team, the opposing team, really the entire game as a whole. All of this takes a lot of your personal time, but the value of the knowledge you will obtain is priceless.
Additionally, you should try to be as patient as possible with your team, especially in your first season. It will take some time for the Players to under where you are coming from and what type of system you as the new manager are wanting to run, so don't get upset after one early lose and decide to rip things up from the bottom of the squad to the top. Instead, try changing your formation or Tactics, or even try mixing up the lineup. And then, if the losses continue to add up, then, and only then, think about making a few moves within your organization.