Get a rope  ladder and get someone to start teaching you drills. Don't settle down and try to specialize for inside centre. The modern game needs you to be able to everything, your step needs to be good, your pass needs to be good, and having a decent boot can throw a lot of pressure off your fly half.

I've often found that timing is the key to being an effective back, (you probably know this already). Make sure you get that rope ladder and develop your stepping skills, it will also make you faster and more responsive meaning you can get better off the bat acceleration.