1st recommendation here is, as always, get a teacher. The reasons are wide-spreading, and in general you'll be happier with the results.
When working on co-ordination, I've always found working with the metronome at a slow tempo the best way to improve it. Chromatic scales, 2 octaves, at quarter note = 40 would be how I would tackle this obstacle.
Be careful, don't hurt yourself, and have fun.