A lot of changes have been brought to PES 2014 and some users may have to take a fresh look at how to play this version of PES. The Training mode might be a good start since it covers a lot of tricks and moves (some old, some new) which will help you to become familiar with skills that give you a good grasp of the game.
Sometimes, a little red exclamation mark helps you know when to press the button and perform the required move. Some can be tricky but will be very useful on the pitch once learned, so be patient, try harder and you will be rewarded!
You can also watch tutorial videos in the Training menu or have a look at the Command List which is available in the Pause menu during a match.