Sorry if I posted this in wrong place, if I did - please, move it to proper subforum

This is my current team - ScreenShooter - Check this out! . I wanted to ask you about what can I do to make it better, what should I focus on first. I thought about getting either really skilled striker (highest I can look atm is 29*) or add one more defender, so I can rotate them better and keep them fresh in order to maintain solid defense.

Also, is there a difference in learning between two players at the same age?