If you want to get the absolute most from your team then you're going to have to take some time to understand each individual's 'player role'. These roles relate to certain physical or mental attributes, with the majority of these going some way to influence both the player in question and his teammates.
Giorgio Chiellini, for instance, comes bundled with the 'grand master' role. This provides the Italian defender with boosted experience for training sessions and, if you make him captain during competitive fixtures, increased experience for teammates after completed games. Making sure you understand the quirks of each player role is essential to getting the most out of each squad member.
It's tempting to test out all of your favourites teams and players right away, but doing so isn't the best way to most efficiently improve your skills. Pick a team and stick with it for at least a few days. Ideally, you only want to use one team until you're comfortable that you understand how the game works and where your own strengths and weaknesses reside. Using one team will help you understand and define the game's structure in a way that doesn't rely on constantly chasing the excitement of using players you've not played with before.
Showing loyalty to a specific team helps to understand how certain tactical and formation changes affects a team and is a much more effective means of coming up with new ways to win without relying on new or better players.
There are various destinations across the internet that house the relevant images required to update PES 2016, allowing you to add the official kits and badges for the English Premier League teams and other essential clubs - Borussia Dortmund, for example.
Whether on console or PC, importing these image files to your game is a simple process and one that is well worth the minimal effort. Playing a Champions League final is a much more engaging experience when it's contested by Chelsea and Manchester City, as opposed to London FC and Man Blue. Although, in reality, neither Chelsea or Manchester City, or their awkwardly-named doppelgangers, have much Champions League hope.