As far as supplements go hit up your vitamin store and pick up some Whey Protein. Its up to you when you want to take it, i know guys who take one before (so it hits their muscles as soon as they start pumping) and one after (try to take that one within 30 minutes of finishing your last excersize).
As for me i hit the gym 6 times a week. Lift 6, Run 4-5 (HIIT- High Intensity Interval Training 2 days, Distance the other days)
For lifting i use just a simple lower upper split really, Legs and Arms one day, Chest, Back, Shoulders the other. Make sure when you make your lifting program you dont go all out on a specific arms day because that'd just be a waste really, unless if youre trying to look good! So combine those arms with legs would be my suggestion
As for passing drills try to pass a ball 75-100 times a day. Also take any generic pole you can find stand 5-10m away from it and pass the ball to it going for as many hits of the pole out of 20 off each hand that you can get. It's one of the best ways to work on your passing accuracy.
I highly reccomend buying either:
a.)
Gilbert Skill Skin
b.)
Gilbert Reflex Trainer Ball
For kicking do this:
Go to your pitch and box kick 20 times off each foot, just getting used to the motion. Once you are used to that, go for accuracy and kicking the ball where you want to off each foot. And just keep working on it. If you want bring a friend and have him stand somewhere on the pitch and try to box kick it as accurately as possible to him.
Most of all work hard, set some lofty yet attainable goals, and have fun.. and always believe in yourself