How should I prepare for the soccer season in an advanced team? (10 points best answer)?

Run, run & run some more. Do lots of suicides. When you are at home, walk around with the ball at your feet all of the time to get used to the feeling, it will help your control. Practice headers, if you have someone to help you that would be best but if you don't then you can use a wall. Then go run some more! Best of luck!