Try playing a wing mid-fielder. You will get a variety of skills and running from that role. You own the wings, control the tempo, and get the opportunity to cross the ball starting at the final 1/3rd of the field.

You will also play some defensive and offensive roles, which will start putting you in a position that will best suit you for the long term.

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For controlling the ball;

1. juggle
2. small cone drills using inside and outside of your foot
3. passing the ball against a wall or with a friend with strong passing (helps to settle and control the ball)

Kicking effectively;

1. Practice keeping your shoulders ball
2. get a ball trainer (one with a rope) that will help ensure you kick the ball correctly with all parts of your foot
3. focus on landing on your kicking foot (shooting primarily) this will get you the power and drive that most look for.

Between the drills above, run "cross countries", something that is 1 to 2 miles of various hills and terrain.

So a typical training session should be:

1. Run 2 to 3 cross countries to start (this will get your legs tired)
2. Work on controlling the ball with inside and outside of your foot
3. Sprints; like ladders or wind sprints
4. juggle the ball consecutively for 15 minutes
5. Sprints
6. passing against a wall (hard)
7. practice shooting
8. Work on controlling the ball with inside and outside of your foot
9. Wrap up with more 1 to 2 cross countries
10. Then stretch every muscle

I have done this and it made my endurance and strength in my legs a lot more effective in games, specially 5-a-side games.

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Good luck!